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SN90RC-4 SN90RC-4 specifications 4-channel rtd/ct wireless sensor node the SN90RC-4 is a battery-powered wireless sensor node that provides support for two 100 ohm platinum rtd inputs, two current transformer inputs and two switch inputs (many other sensor configurations are available, contact murata for details). connectivity is provided through a 900 mhz frequency hopping spread spectrum (fhss) wireless connection, making use of the companion lg90e ethernet gate- way or lg90c cellular gateway. the unique low-power architecture used in the SN90RC-4 provides years of battery operation. sensor data and battery status are automatically transmitted based on user-configurable conditions, simplifying appli- cation software design. the wireless sensor node can be configured over-the-air or through its serial port. - 4 analog channel, battery powered wireless sensor node - 2 rtd inputs and 2 current transformer inputs plus 2 switch inputs - supports 2- and 3-wire 100 ohm platinum rtds - true rms current measurement - switch state and change-of-state monitoring - non-volatile data logging memory - robust 900 mhz fhss dnt90 radio - internal antenna or external 2 dbi antenna options - optional 128-bit aes encryption - compatible with lg90e and lg90c gateways - configuration over-the-air or through the serial port - up to 5 years of battery life - fcc and canadian ic certified for unlicensed operation characteristic sym notes minimum typical maximum units sensor inputs 2- or 3-wire 100 ohm platinum rtds current transformers contact closures rtd type 100 ohm platinum, 0.00385 alpha rtd temperature range -200 +600 o c rtd resolution 0.0625 o c rtd accuracy 0.3 o c rtd measurement data format 16-bit signed value input range for current transformer 0 3.34 ma rms current measurement resolution 16 bits current measurement accuracy 2 % current measurement data format 16-bit unsigned value open contact voltage 3.3 v closed contact current 33 a contact status data format 8-bit unsigned value ?2010-2015 by murata electronics n.a., inc. SN90RC-4 (r) 04/17/15 1 of 5 www.murata.com copyright ? murata manufacturing co., ltd. all rights reserved 2010
SN90RC-4 specifications characteristic sym notes minimum typical maximum units internal battery voltage range 3.0 3.6 v internal battery voltage accuracy 2 % internal battery voltage data format 16-bit unsigned value serial interface rs232c, 38.4 kbps, 8n1, no flow control radio murata dnt90 fhss radio operating frequency range 902.76 927.24 mhz rf data rate 100 kbps number of rf channels 25, 26 or 52 rf transmit power, eirp, chip antenna 40 or 158 mw rf transmit power, eirp, 2 dbi antenna 63 or 250 mw receiver sensitivity, 10e-5 ber: -100 dbm internal antenna smd chip antenna optional external antenna 2 dbi rpsma dipole antenna supplied battery lithium thionyl chloride (ltc) c cell, 8.5 a-hr operating ltc battery life, -40 to +85 o c: 1 minute report interval 1.5 years 15 minute report interval 5 years 1 hour report interval 5 years optional battery 3 alkaline aa cells, 2.5 a-hr operating alkaline battery life, -20 to +50 o c: 1 minute report interval 0.4 years 15 minute report interval 2+ years 1 hour report interval 3+ years report triggers: timer 100 ms to > 1 year measurement value high and low measurement thresholds (channels are individually programmable) switch input switch opening event, switch closing event, or both events operating temperature range -40 +85 o c operating humidity range, non-condensing 5 95 %rh nominal dimensions 5.5 x 2.5 x 1.3 inches 140x64x33mm mounting left and right flanges, two pre-drilled holes plus slot in each flange ?2010-2015 by murata electronics n.a., inc. SN90RC-4 (r) 04/17/15 2 of 5 www.murata.com copyright ? murata manufacturing co., ltd. all rights reserved 2010
SN90RC-4 operation the SN90RC-4 is a 900 mhz fhss-based wireless sensor node that supports two 100 ohm platinum rtd inputs, two current transformer inputs and two switch closure inputs. the SN90RC-4 includes internal stor- age for more than 1500 time-stamped sets of read- ings, where each set includes the four analog channels and the two switch inputs. the SN90RC-4?s very low average power consumption provides up to five years of operation from a 8.5 a-hr c cell ltc bat- tery. alternately, the SN90RC-4 can be powered from three inexpensive aa batteries in limited temperature range applications where shorter battery operating life is acceptable. the SN90RC-4 wireless sensor node is available with either an internal antenna or an external 2 dbi dipole antenna. the SN90RC-4 includes two led indicators and two buttons to facilitate installation, activation, configura - tion and testing. as shown in figure 1, j1 and j2 provide connection points for 2- or 3-wire rtds. j3 and j4 provide con- nection points for current transformer inputs. j5 and j6 provide connection points for contact status inputs, with j7 providing connection points for 3-wire rs232 communication with a host computer. the SN90RC-4 automatically reports the sensor input readings on user-defined intervals and condi- tions, eliminating the need for application polling. when the SN90RC-4 sends data, it wakes up, syn- chronizes with its gateway, transmits the data and quickly returns to sleep, maximizing battery life. the internal battery voltage is included in each sensor report, providing continual information on the battery status. the SN90RC-4 can be configured over-the-air, or through its serial port using a standard 3-wire rs-232 connection.

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pin name i/o description 1 rtd+ i 3-wire rtd positive (red) input. this input is connected to the rtd current source and the adc positive differ - ential input. 2 rtd- i first 3-wire rtd negative (black) input. this input is connected to the adc negative differential input. this in - put is not used with a 2-wire rtd. 3 rtd-/gnd i second 3-wire rtd negative (black) input or 2-wire rtd negative input. this input is connected to the rtd ground return. connector j1 and j2 description, 2- or 3-wire rtd input ref name i/o description 1 host tx i input terminal for host rs232 tx. 2 host rx o output terminal for host rs232 rx. 3 gnd - rs232 ground terminal. connector j7 description, 3-wire rs232 ref name i/o description 1 contact i contact input. this terminal is connected to +3.3 v through a 100 k resistor. 2 gnd - contact ground terminal. connector j3 and j4 description, current transformer input connector j5 and j6 description, contact input ref name i/o description 1 current 1 i first current transformer input. there is a 300 ohm current shunt between this terminal and terminal 2. 2 current 2 i second current transformer input. 3 gnd - ground terminal. ?2010-2015 by murata electronics n.a., inc. SN90RC-4 (r) 04/17/15 4 of 5 www.murata.com copyright ? murata manufacturing co., ltd. all rights reserved 2010
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1 7 figure 2 note: specifications subject to change without notice. ?2010-2015 by murata electronics n.a., inc. SN90RC-4 (r) 04/17/15 5 of 5 www.murata.com copyright ? murata manufacturing co., ltd. all rights reserved 2010

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