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ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 1 rs232 r adio m odem 232C-868FR1 ? rs-232 compatible ? selectable baud rate 1200bps ? 38.4kbps ? range up to 800 metres ? european operation 868mhz ? rf power 0-7 dbm ? network configurable ? transparent or data verified communications modes ? 4 user configurable digital i/o channels ? standard hayes command set ? internal led indication of power and data tx & rx ? 12vdc power supply ? conforms to etsi 300-220 ? requires no radio licence to operate ? tough abs enclosure description the r.f. solutions 232C-868FR1 radio modem provi des fast and reliable rf data communications at an exceptionally competitive price. wh ilst the rf modem is simple to use it is also highly adaptable and can be used in a wide variety of applications. the modems can be configured for various operating modes to provide: 1. an ?invisible? rs232 point to point link, reproducing the function of a half duplex rs232 cable. 2. a rs232 point to point link with data flow control to provide data verification. 3. a functionality similar to t hat of a client/server network, where each modem is assigned an address with a maximum of 255 clients per network and a maximum of 65535 networks. 4. point to point data transfer for up to four digital i/o signals with continuous resend and automatic data acknowledgement. the modem is supplied in a tough abs enclosure, wi th wall mounting lugs. the external 868mhz antenna offers a range of up to 600 metres line of sight. the modem is supplied with an rs232 cable and requires only a 9-12vdc power supply.
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 2 rs232 r adio m odem 232C-868FR1 contents 1 technical spec ifications ................................................................................. 3 1.1 functional de scripti on ............................................................................... 3 1.2 status led?s ............................................................................................. 3 1.3 connections .............................................................................................. 3 1.4 electrical char acterist ics........................................................................... 4 1.5 temperature range and dimens ions ....................................................... 4 2 software specif ications................................................................................... 5 2.1 operating modes ...................................................................................... 5 2.2 quick setup guide.................................................................................... 8 2.3 hayes or ?a t? mode .................................................................................. 9 2.4 standard commands descripti on............................................................... 9 2.5 radio test commands ........................................................................... 10 2.6 registers de scripti on .............................................................................. 10 3 ordering info rmation ..................................................................................... 12
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 3 rs232 r adio m odem 232C-868FR1 1 technical specifications 1.1 functional description the rf modem is software configurable using the standard at command set. commands can be entered via the rs232 port using a control device with communications software (for example a pc with windows hyperterminal). using this method the modem can be set to four different modes. in transparent mode the modem provides an ?invisible? serial link and reproduces the function of a half duplex rs-232 cable. transparent secured mode operates in the same manner of transparent mode and also provides data flow control to ensure the correctness of transmitted data frames. this provides the user with a fully data verified point to point communications link. addressed secured mode provides a functionality similar to that of a client/server network except that there is no server and all of the clients can communicate with each-other. each modem is given an address with a maximum of 255 clients per network and a maximum of 65535 networks. in i/o copy mode the four digital i/o channels can be used to transfer ttl logic signals from one modem to another. as long as the modem remains in i/o copy mode the signals are automatically resent after a 1 second time-out with ensured reliability via automatic data acknowledgement. detailed explanations of the available software modes are given in section 2. 1.2 status led?s the rf modem has six led?s, representing the following signals: ? txd ? transmitting data ? rxd ? receiving data ? cts ? clear to send data ? rts ? ready to send data ? pwr ? power on 1.3 connections 1.3.1 digital i/o when used in i/o copy mode four digital i/o si gnals can be presented on the 8 pin sip header on j2, as shown in the diagram above. please refer to secti on 3.3 for control information when using the modem in i/o copy mode. 1.3.2 power the rf modem requires a 9 - 12v @ 100ma power s ource. on the power jack the centre is +ve connection.
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 4 rs232 r adio m odem 232C-868FR1 1.3.3 rs232 connector the rf modem interfaces to the host computer via an rs232 connection using a standard db9 connector as shown in the diagram below. 1.4 electrical characteristics specification conditions min typical max units channel center frequency - 869.850 mhz aggregate air data rate - 10 kbps modulation type - fsk - range line of sight 800 m conformity testing / standard - etsi 300 220 - standby current consumpt ion 0.004 0.006 0.020 ma receiving sensitivity cer <10-3 -101 dbm average cer input signal -50 dbm <10-6 - p1db cer <10-3 -10 dbm number of channels - 1 - selectivity at +/-150 khz 36 db current consumption 30.0 33.0 33.0 ma transmitting output power @ vcc = 12 v - 7 dbm number of channels - 1 - current consumption 27.0 30.0 33.0 ma 1.5 temperature range and dimensions storage temperature: -40 o c to +85 o c. operating temperature: -10 o c to +55 o c with full specificat ion characteristics -20 o c to +85 o c with performance deteriorated enclosure dimensions: 110mm x 85mm x 35mm pcb dimensions: 99mm x 74mm 8 3 2 20 7 6 4 5 22 1 2 3 4 5 6 7 8 9 pc serial port dte (db25) rf modem dce (db9f) tx rx dtr gnd rts cts 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 pc se rial port dte (db9) rf m odem dce (db9f) tx rx dtr gnd rts cts
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 5 rs232 r adio m odem 232C-868FR1 2 software specifications 2.1 operating modes the rf modem is able to operate in four different modes which can be configured by setting register values using at commands. sections 2.2 - 2.4 give a full explanation of how to program the registers, the operation of the different modes is expl ained in detail in the following paragraphs. 2.1.1 transparent mode in transparent mode, the rf modem behaves like a wired serial link, i.e. the modem does not only transmit to the radio channel every data received on the serial link, but also transmits on the serial link the information received on the radio channel. basically the rf modem reproduces the hal f-duplex function of a rs-485 cable. there is no flow control performed by the modem in the transparent mode, neither on the serial link nor on the radio link. flow control must be carried out by software applications via various protocols in use such as modbus, jbus, etc? consequently, in transparent mode it is not possi ble to change the modems parameters without a temporary return to hayes mode. note : the user?s software application must adequately verify that all buffers are transmitted correctly taking into account that an interrupted transmission link may lead to losing one or several buffers. 2.1.2 transparent secured mode in order to confirm the correctness of the tr ansmitted data frames, data flow control between the modems is added to the transparent mode, so that each data transfer is ?data verified?. this mode shall be operated for point-to-point communications only. transparent secured mode or transparent ?data verified? mode?s purpose is to offer an optimal radio link quality and to provide transparent mode with the ne cessary security in case flow control would not be included within the user?s application software. the risk of data loss is much lower than during the us e of application software only because this latter is dependent on the intermediate times inserted by the serial link. moreover, a flow control is performed on the serial link in order to warn the user that the buffer (including 132 characters) is saturating. the warning level is default set to 132 characters and can be programmed via register s218. note: the user?s software application must adequately verify that all buffers are transmitted correctly taking into account that an interrupted transmission li nk may lead to losing one or several buffers. after n time repetition of a buffer (n programmable up to 255 with s223) without a correct acknowledgement the buffer shall be considered as lost. 2.1.2.1 ?secured? link algorithm the transmitting modem proceeds to data framing: ? transferred data count up. ? transferred data frame type. ? frame number. ? data to be transmitted. ? 16 bits checksum. the receiving modem analyses this data frame and checks its consistency. when the data frame is received correctly, the re ceiver transmits an acknowledgement back to the transmitter, and delivers the received da ta framing to its serial link. in case the reception is not without errors, the re ceiver requests a new framing transmission to the transmitter. the number of repetitions depends on the parameter programmed in the modem configuration (register s223). at serial port level, each transmitted data frame is ?data verified?, but no statement asserts to the user whether the data frame has been transmitted yet or not.
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 6 rs232 r adio m odem 232C-868FR1 in ?transparent secured mode?, a time-out is defined to indicate the end of a frame. this time-out is a programmable parameter (register s214) separating each frame from the next one. 2.1.3 flow control two types of flow control are available: ? hardware: cts/rts (the modem manages rts signal only). ? none register s216 can be used to program this parameter: ? '0' stands for hardware flow control. ? '2' indicates no flow control. 2.1.4 addressed secured mode the addressed secured mode is similar to a client/ser ver network mode, the difference is that there is no server and all clients can communicate with each other. addressed secured mode?s purpose is to offer an opt imal radio link quality and to provide transparent mode with the security of the secured mode. this transparent addressed secured mode includes the additional feature to use an address field to address one particular client. data management is as follows: ? data transmissions are fully ?data verified?. ? the modem acts as in transparent mode, adding frame encapsulation. ? identification of clients with a specific num ber added at the beginning of each data frame. example: "1=hello" sends the data frame "hello" to client no.1. ? the receiver client recognises the client tr ansmitting modem by the number starting the data frame. example: "002=hello" indicates that data frame "hello" comes from client no.2. o
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 7 rs232 r adio m odem 232C-868FR1 ? you can add one frame ending character: carria ge return, after each received frame. this in order to distinguish each frame. example: "002=1458 003=4587" indicates data frame "1458" comes from client no.2, and data frame "4587" comes from client no.3. ? no server, each client can communicate with each other. ? maximum of clients per network = 255, maximum of networks = 65535. ? the data frame format can be configured (client id at beginning, cr at end, adcon modems frame format compatibility) via register s255. 2.1.5 basic illustration of transparent modes transparent mode serial link no.1: -> : serial link no. 2 serial link no.1: <- : serial link no. 2 transparent secured mode serial link no.1: -> : serial link no. 2 ack <- ack serial link no.1: -> : serial link no. 2 nack <- nack -> : serial link no. 2 ack <- ack serial link no.1: <- : serial link no. 2 ack -> ack transparent addressed secured mode serial link no.1: 2= -> 1= : serial link no. 2 ack <- ack serial link no.1: 2= -> 1= : serial link no. 2 nack <- nack 2= -> 1= : serial link no. 2 ack <- ack serial link no.1: 2= <- 1= : serial link no. 2 ack -> ack 2.1.6 i/o copy mode in i/o copy mode the i/o lines of a rf modem are copied to the other rf modem. the following registers have to be programmed: ? master: s220=6 and s260 for the i/o configuration. ? slave: s220=7 and s260 for the i/o configuration (?complementary? configuration according to master) once configured as above, both modems start i/o copy as soon as they get out of hayes mode (ato command). ? this mode works as follows: ? the master sends its input values to the slave. ? the slave sends an ack to the mast er when the ?input? data arrived. ? the slave copies the master?s input on its output. ? after a 1 second time-out, the slave sends its inputs to the master. ? the master returns an ?ack? when the input data is arrived. ? the master copies the slave?s inputs to its outputs. ? after a 1 second time-out, the master sends its inputs to the slave. ? and so on?
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 8 rs232 r adio m odem 232C-868FR1 the i/o copy mode stops as soon as the modem returns to hayes mode (+++ command). 2.2 quick setup guide the 232C-868FR1 is supplied with all its settings in the default values. it can be used with bundled mtc workbench software to establish a simple transparent point to point link by following the steps outlined below. 1. install the mtc workbench software, supplied on the bundled cd onto your pc. 2. connect your modem to the com port of your pc using the supplied rs232 cable, apply power to the modem and load the mtc workbench software. the pwr and rts leds will now be on. 3. when prompted to launch auto-configuration select ?yes?. the modem will now be automatically detected by the software program. 4. in the settings menu change the user level to advanced. now repeat auto-c onfiguration by selecting the option from the modem menu. 5. from the tools menu select terminal and open a terminal window on the com port connected to the modem. you can now type text into the terminal window, if the port is opened (by pressing the ?open port? button) then the text data will be sent over the serial link to the modem, as shown opposite. 6. repeat steps 1-5 using either another pc or a different com port on the same pc. 7. if the configuration settings are the same for both modems then you should now be able to wirelessly send text from one com port to the other. notes for full instructions on the use of the mtc wo rkbench software please refer the manual provided on the cd bundled with the modems. the modems configuration settings can be changed by double clicking on the modem name, ?b868-tiny? under the com port in the tree window. once you have changed the settings to those which you require they can be propagated throug h to the modems registers by clicking on the apply button. you can also change the configuration settings by entering at commands into the terminal window in mtc workbench. please refer to section 2.3 below for a description of the at commands available.
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 9 rs232 r adio m odem 232C-868FR1 2.3 hayes or ?at? mode the hayes or 'at' commands comply with the hayes protocol used in pstn modem standards. this ?at? protocol or hayes mode is used to program the modem parameters, based on the following principle: ? a data frame always begins with the 2 ascii ?at? characters, standing for ?attention?. ? commands are coded over one or several characters and may include additional data. ? a command is always ended by a carriage return. a t command additional command ... note: register numbers and values used in the at commands are in decimal format. the only exception to this data-framing rule is the command to enter the enter at-mode. in this case, only the escape code (?+++? by default) must be typed and followed by a silent time at least equal to the time out. and shall not be used. note: all characters of the same command must be typed in quickly to prevent a timeout before the whole command has been entered. alternatively commands can be cut and paste from notepad to ensure the whole command is entered within the time limit. note: generally a successful at command will return 0 and an unsuccessful command will return e. despite its similarity to standard telecommunicati on modems, the 232C-868FR1 remains a radio link modem and is consequently fitted with some particular additional ?at? commands. 2.4 standard commands description '+++' enter at-mode. this command gives an instant access to the modem parameter set-up (hayes or at- mode), whatever the actual operating mode in process might be. this command shall not be started with at, but by a silent time duration whose parameter entering is defined in milliseconds in register s214. n.b.: by ac tivating the at-mode, the modem inactivates radio reception. ?ato? exit at-mode this command activates the operating m ode as stored into register s220. 'atsn?' display value of register n. the modem operating parameters are stored in ?s? classified register s. s registers are numbered from 0 to 512. some parameters are standard for every hayes type modems, other are specific to the 232C-868FR1 modem (s ee section 2.6 for register descriptions). operating parameters are stored in eeprom memory and automatically set-up during modem reset and modem turn on. 'atsn=m? change value of register n to m. changed values of registers are automatically stored in the modem eeprom memory. 'at/s? display values of significant registers. all significant registers for the modem (radio c onfiguration, serial c onfiguration, operating mode,) are sent to the serial link, read y to be displayed by software like windows hyperterminal. 'at/v?: display values of the modem software version.
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 10 rs232 r adio m odem 232C-868FR1 information concerning the version number and installation date is sent on the serial link; ready to be displayed by software like windows hyperterminal. 'atr?: hayes registers reset to default values this command allows the user to reset a ll the stored eeprom registers to their default values (see registers description below). 'atp?: switch to stand-by mode this command allows the user to switch to stand-by mode. the modem is in normal mode by default. the modem switches back to normal mode with a character reception from the serial link. 2.5 radio test commands these special at commands are integrated into the rf modem in order to make measurements during continuous transmission, and are primarily used during radio tests (radiated power, bandwidth, etc.) to show conformance to the ets 300 220 standard. it stops when any character is sent: ? att0 : transfer of a pure carrier ?0? ? att1 : transfer of a pure carrier ?1? ? att2 : transfer of a modulated carrier at f(maximum) ? att3 : transfer of a modulated carrier at f(average) ? att4 : transfer of a modulated carrier at f(minimum) 2.6 registers description the rf modem can offer several possible configurat ions using a set of parameters. those parameters are located in registers and have a default value. this value can be modified or consulted via hayes commands. the parameters of the radio modem are stored in the eeprom and can ther efore be changed up to 10,000 times. the parameters are available when sw itching on the modem. the registers are listed below: radio access register name description r/w s204 carrier length indicates the radio carrier length in milliseconds, sent at the beginning of each radio frame. valid between 4 and 50 milliseconds. default value: 15ms serial link access register name description indicates the serial link rate: value rate r/w s210 baud rate '1' '2' '3' '4' '5' '6' -> -> -> -> -> -> 1200 bits/s 2400 bits/s 4800 bits/s 9600 bits/s 19200 bits/s (default value) 38400 bits/s indicates the number of data bits on the serial link: r/w s211 data length '7' '8' -> -> 7 data bits. 8 data bits (default value)
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 11 rs232 r adio m odem 232C-868FR1 r/w s212 parity indicates the parity on the serial link: '1' -> no parity (default value) '2' -> even parity '3' -> odd parity r/w s213 number of stop bits number of stop bits on the serial link: '1' -> 1 stop bit (default value) '2' -> 2 stop bits r/w s214 time-out time-out in millisecond s on the serial link. valid between 2 and 100 milliseconds. default value: 5 ms r/w s216 flow control indi cates the flow control mode: ?0? -> rts/cts ?2? -> none (default value) r/w s218 buffer size indicates the maximum size of frames. when this maximum size is reached, the modem switches the cts signal. valid between 30 and 245 bytes. default value: 245 bytes operation access register name description indicates the operation mode of the modem. '1' -> transparent (default value) '3' -> transparent secured '6' -> master i/o '7' -> slave i/o '9' -> addressed secured ?10? -> demo mode ? master r/w s220 operating mode ?11? -> demo mode ? slave r/w s221 autorepeat indicates auto-repeat status in transparent mode (i.e. whether the modem automatically replies a data frame) ?0? -> autorepeat off (default value) ?1? -> autorepeat on r/w s223 number of retries indicates the maximum number of retries when a message contains errors in secured mode. valid between 0 and 255 (modulo 256). if the value is ?0?, frames are not checked and considered as good (used for tests). default value: 2 addressed management access register name description r/w s250 network number indicates the network number using 2 bytes. only members of the same network can communicate together. valid between 0 and 65535 (modulo 65536), it is set to ?0? when the modem is not initialised. nb: setting s250 to ?0? also sets s252 to ?0?. default value: 0
ds232-4 june ?04 ?2004 reg. no. 227 4001, england page 12 rs232 r adio m odem 232C-868FR1 r/w s252 client number indicates the client number using 1 byte. the client number is unique for a given network. valid between 0 and 255 (modulo 256), it is set to ?0? when the modem is not initialised. default value: 0 r/w s256 default addressee in addressed secured mode, indicates the address to which every radio frame will be sent to (default address). default value: 0. i/o management access register name description r/w s270 digital i/o values (j2-3 to j2-6) allows writing and reading of digital i/o ports, according to their configuration (see above). each port, i.e. each bit, can be either written or read with digital values 1 (equivale nt to vdd) or 0 (equivalent to 0 volts). included between 0 and 15 (register). default value: 0 r/w s260 digital i/o configuration (j2-3 to j2-6) allows configuring the digital i/o as input or as output. each i/o is independent of others and is represented by two bits of that register. j2-6 j2-6 j2-5 j2-5 j2-4 j2-4 j2-3 j2-3 bits to 00 => i/o port equivalent to digital input (default value) bits to 01 => i/o port equivalent to digital output bits to 10 => i/o port dedicated bits to 11 => unused value e.g. s260= 00000100 = 4 means: j2-1, 3 and 4 configured as input, j2-2 configured as output. 3 ordering information part number description 232C-868FR1 modem rs232, 868mhz 600 metres psu12v1auk power supply 240vac (12vdc @1000ma) psu12v1ain power supply 240vac (12vdc @1000ma) for more information or general enquiries, please contact r. f. solutions ltd., unit 21, cliffe industrial estate, south street, lewes, e sussex, bn8 6jl. england tel +44 (0)1273 898 000 fax +44 (0)1273 480 661 email sales@rfsolutions.co.uk http://www.rfsolutions.co.uk rf solutions is a member of the low power radio association all trademarks acknowledged and remain the property of the respected owners information contained in this document is believed to be accurate, however no representation or warranty is given and r.f. sol utions ltd. assumes no liability with respect to the accuracy of such information. use of r.f.solutions as critical components in life support systems is not authorised except with express written approval from r.f.solutions ltd.

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