WISCO International

Home Page | Products | Manufacturers | Zetron | Quotation | Search | E-mail

MODEL 18/18 + / 1801
Control Link



Say Goodbye to Leased Lines

Control Link is a wireless remote control and monitoring system consisting of two or more Model 18 or 18+ telemetry modules and the optional Model 1801 Status and Control Panel. When connected to conventional or trunking radios, Control Link can replace up to 20 dedicated or leased telephone lines for discrete on/off or analog monitoring and control.

Control Link provides a cost-effective wireless alternative for remote control and monitoring versus leased phone lines or dedicated wireline cable. Optional Models 1512 SentriDial and 1516 SentriVoice can provide voice alarms via phone or radio triggered from Control Link outputs.

Control Link can be configured as a point-to- point system or point-to-multi-point system. Each Control Link is bidirectional, capable of both sending and receiving data. All data transmissions are two- way and require a valid handshake response; if no handshake occurs, a communication failure alarm is generated.


A minimum Control Link system consists of two Model 18s connected to radios and powered by 12 VDC. Control Link #1 monitors inputs for changes and, upon detecting a change, transmits a data packet containing the input change information over the radio. The data packet is received by another radio connected to Control Link #2. Control Link #2 then reproduces the change at the corresponding output. These input and output changes can be discrete on/off or, in the case of the Control Link Model 18+, analog values that are varying voltages (0-5V) or current (4-20mA). Transmission of analog signals allows remote monitoring of transducers connected to physical parameters like temperature, pressure, power, etc.


  • Water System Monitoring and Control
  • Water Tanks Monitor and Control
  • Control and Monitor Remote Lift Stations
  • Irrigation Monitoring and Control
  • Monitor and Control Remote Sites for Temperature, Pressure, Flow, Power, Security
  • Oil/Gas Refineries and Pipelines
  • Food and Chemical Processing
  • Industrial Wireless Process Control


Fast, Accurate Transmissions
Each data transmission has built-in error detection that assures the data will be correct. All transmissions require a handshake or they will be resent.

Multiple I/O Per Unit
The Model 18+ offers 20 bidirectional channels of discrete and analog I/O. The Model 18 has 8 discrete I/O channels.

Closed Loop Control
Each Model 18/18+ has both monitoring and control capability and can signal confirmation that a control function was executed.

Multiple units may be used on the same radio to expand the I/O capability.

Shares Existing Radio Channels
The Model 18/18+ monitors the channel for other traffic and will send data between other transmissions

Communication Failure Alarm
If a Model 18/18+ is unsuccessful in communicating with another Model 18/18+, it initiates a communication failure alarm.

Report by Exception
The Model 18/18+ will instantly report a change in state.

Point to Multi-point
The Model 18/18+ allows multiple remote sites to report to or be controlled by a single Model 18/18+.

The Control Link is configured by RS-232 port to allow the user to change parameters such as radio key delay.

Input/Output Constraints

  1. Discrete I/O cannot link to analog I/O.
  2. A single input can only control a single output and vice versa.
  3. An input on one Control Link may not control an output on the same unit.

The Model 1801 Multipurpose Status and Control Panel provides status display for up to 16 points and on/off control for 16 remote operations. The Model 1801 panel comes in a standard 19� rackmount configuration. This panel can be used with a variety of existing systems to provide a user configurable display and control station.

The Model 1801 can be connected to Model 18/18+ to provide a centralized status and control point. Each of the 16 toggle switches can be connected to various motors, pumps, etc. to furnish on/off control. The 16 LEDs can be connected to points in a process such as flow sensors, level sensors, thermostats, etc. to indicate status.

The Model 1801 provides a cost-effective, off the shelf alternative to custom fabricating display and switch panels for different applications. The Model 1801 will work with a variety of equipment to furnish an off the shelf control panel that is easy to use, maintain, expand and repair.


Model 18

  • 8 discrete inputs (senses on/off)
  • 8 control outputs

Model 18+

  • 16 discrete inputs (senses on/off)
  • 16 control outputs
  • 4 analog inputs (0-5 VDC, 4-20 mA)
  • 4 analog outputs (0-5 VDC)

Model 1801Status Panel

  • 16 status LEDs
  • 16 control switches


Power 10.5 to 24VDC. Max: 240mA @ 16VDC. (All indicators ON)
Size 19�W x 1.75�H x 1.6�D, designed to fit a standard 19� equipment rack
Weight 2 lb
Temperature 0 to +60 degrees C
Monitoring Capacity 16 contact closure sensors or open collector outputs to ground
Remote Control Capability 16 SPST toggle switches to common ground
Indicator Inputs Max: 24VDC @ 25mA each
Toggle Switch Contact Closure Max: 50 VDC or 50 VAC @ 300mA
Power 13.8VDC nominal, 10.5-16 VDC
Current 75mA typical, 150mA max. @ 16V
Temperature 0 to +60 degrees C
Size 7.25�W x 10.5�D x 2.25�H
Weight 2 lb
Audio Output 20mV to 2V P-P (mic level audio),
1K ohm
Audio Input 100mV to 4V p-p, 50K ohm.
Channel Busy In (COR) Low - 0-.7VDC, <100 ohms. to ground
High - 3.5 to 12 VDC, >10K ohms to ground
PTT Output (Push-to-Talk) Relay to ground, 300 mA max, normally open or closed
Radio Modem Specifications
Data Rate 1200 Baud
Signaling Minimum shift keying
Signal Integrity
Required Signal
95% success at 12dB SINAD
Baud Rate 4800
Parity None
Bits 8
Stop Bits 1
External Inputs
Contact Closure Model 18: 8 inputs
Inputs Model 18+: 16 inputs
Lo<.8 volts
Hi>2 volts
+ 48 VDC
Protected to
Analog Inputs Model 18+: 4 inputs
0 to 5 VDC analog sensor with 8-bit
A/D input. 20mV/bit, 256 levels.
Protected to + 48VDC
External Outputs
Open Collector
Model 18: 8 outputs
Model 18+: 16 outputs, can switch up
to Vcc + 1V @ 100mA
Analog Outputs Model 18+: 4 outputs
0 to 5VDC, 8-bit D/A, 20mV/bit,
256 levels
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

Home Page | Products | Manufacturers | Zetron | Quotation | Search | E-mail