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MODEL 1732
Remote Terminal Unit



Zetron Model 1732 Remote Terminal Units (RTU) are the next generation SCADA/Telemetry system from Zetron. The M1732 is a cost-effective solution for applications that need to connect widely distributed remote sites to a central control program using radio, telephone or wireline communications media.

The M1732 interfaces easily with a wide variety of field equipment at the remote sites including inputs from analog and digital sensors as well as outputs to control devices such as contact switches and set-point controllers. System integrators can configure the M1732 to initiate alarm-on-exception reports to the central host controller, execute complex control algorithms based on sensor inputs, and store measurement data for later recall.


The M1732 offers a full range of process interface capability for both analog and digital signals or �points� including analog inputs, analog outputs, digital contact inputs and outputs and relay outputs. All of the I/O signal conditioning cards are modular so that the RTU can be easily sized to meet system requirements.

The Analog Input Module measures +/-10 VDC or 4-20 mA signals with a high-accuracy 12 bit A/D. It can also be configured to function as an accumulator.
The Analog Output Module can provide both 0-5 VDC and 4-20 mA signals. The Digital Input/Output Module allows individual points to be configured either as inputs or outputs and to specify whether the point is normally open (NO), normally closed (NC) or momentary. Digital inputs can also be configured as pulse counters. Provision is made to debounce both analog and digital signals.


The M1732 typically operates with conventional or trunked radio systems, direct audio leased lines, or microwave to communicate with a Model 1730 System Controller for both periodic polling and alarm-on-exception reporting. In addition, the M1732 can be configured to report directly to the central control system over spread spectrum radio, cellular or conventional telephone. The M1730 supports most third party control systems using MODBUS protocol.


  • Up to 455 Input/Output points/RTU
  • Modular digital and analog I/O
  • Programmable local logic, data logging and failsafe operation
  • Conventional or trunked radio interface
  • Telephone, cell-phone or wireline options
  • Optional spread-spectrum radio
  • Over-the-air programming (OTAP)


Temperature 0 to 50 degrees C
Humidity 0 to 95% non-condensing
Watchdog timer and power monitoring for failsafe operation
LED indicator of unit status
Battery backed Accuracy to +55 PPM at 30C,
Real Time Clock + 120 PPM from -10 to 70C
Unit Housing*
Zetron Case For up to 4 expansion modules Approx. 7.5"x12"x7"
Medium NEMA* Case For up to 13 expansion modules 14" x 16" by 6"
Large NEMA* Case For up to 28 expansion modules 20" x 24" by 8"
*NEMA units are NOT included and must be purchased separately.
Standard 16VDC 2A max, 120VAC input
Optional 220VAC input
Battery Charger Module 7Ah sealed Gel Cell battery
Power Requirements
Core Module 250 mA max, 200 mA typical
Radio Interface Module 100 mA max, 40 mA typical
Phone Modem Module 100 mA max, 50 mA typical
Analog Input Module 50 mA max , 30 mA typical
Analog Output Module 50 mA max, 20 mA typical
Digital I/O Module 50 mA max, 20 mA typical
Relay Output Module 200 mA max, 20 mA typical
Telephone Modem
Ringer equivalents 0.45B
Automatic line seizure
� Maximum voice power output to PSTN, -10 dBm
� Maximum DTMF power output to PSTN, -1 dBm
DTMF signal 100 msec on/100 msec off
Zetron Radio Interface
Input levels 50 mV to 5 Vpp, Adjustable with two gain ranges
Input impedance > 50 kohms at 1 KHz
Output level 50 mV to 5 Vpp, Adjustable with two
gain ranges
Output impedance < 700 ohm at 1 KHz
� Flat audio in and flat audio out
� COR adjustable0.1 to 4.5VDC
PTT output relay to ground < 300 mA max, normally open or closed position
Spread Spectrum Radio
Frequency Range 902 to 928 MHz
Modulation Type Spread spectrum GFSK
Spreading method Frequency hopping
RF Power Output Up to 1watt
Data Rate 1200 bps to 115.2 kbps
RS-232 Connection
One RS-232 channel with full handshake (RTS, CTS, and
DTR, RI). Speeds to 9600 bps.
The user configures I/O modules to meet the needs of each
application. The M1732 can include up to 16 modules.
Digital I/O Module 16 digital inputs/outputs per module
Digital outputs - open collector 50VDC max, 100 mA Max.
Digital Inputs referenced to ground, Weak pull-ups provided (to +12V).
Contact closure to ground or 0-5V Voltage change.
Logic Low <600 ohms or < 1.0VDC
Logic High >2.5 kohms or >2.0VDC
Protected to +50VDC through 1 kohm
Relay Output Module
Six Relay outputs per module
Form C contacts 120VAC 1A, 24VDC 2A
Analog Output Module  
Four Analog outputs per module
8 bit DAC, single ended referenced to ground 0-5V or 4-20 mA
Voltage output accuracy +0.5% of values +40 mV at zero to 50 degrees C
Current output accuracy
� Max load 800 ohms +3.75% of value +0.16 mA
� Zero to 50 degrees C
Analog Input Module
11 Analog Inputs per module, single ended, referenced to ground
12 bit resolution
Voltage Range +10 V
(-20 to 50 degrees C)
+0.7% of reading + 40 mV
Linearity +10 mV or +2 counts
FCC Part 15 for Electromagnetic Interference (EMI) and Part 68 for Telephony Interfaces
CE Approved
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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