WTSSR-M - RS232 5-Channel Solid State Relay Card

WTSSR-M - RS232 5-Channel Solid State Relay Card
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Our Price:  £49.00(£58.80 Inc. VAT)

Digital Outputs:  5


3 in stock, immediate despatch  

3 in stock, immediate despatch

5 optically isolated solid state relays can be wired directly to in-circuit buttons and switches to allow software control of their operation. Built-in sequence generator.

Special Offer:  Discounts of 7%, 10%, 12.5% and 15% are available when you order 10, 25, 50 and 100 items or more of this product.

  • 5 optically isolated solid state relays.
  • DIP switch addressable; stack up to 32 modules on the same port for 160 relays.
  • Wire relays directly to existing switches to allow software control of their operation.
  • Control each relay individually or update all five relays as a group.
  • Read current on/off state of relays from host.
  • On-board relay closure indicator LEDs give visual confirmation of relay on/off states.
  • Delay timer allows momentary relay closings and openings with a single command.
  • Built-in sequencer for complex triggering.
  • Set default state of each relay which will be loaded upon power-up.
  • Industry standard RS-232 interface.
  • Wide power supply range (8 to 20 VDC).
  • Screw-terminal connectors used on all inputs outputs.


The Stackable range is a truly novel innovative range of data acquisition and control units suitable for use with any RS232 equipped PC. You need only use those modules required for your task: whether it's digital I/O, analogue input or output, thermocouple input, relay boards, stepper motor drivers, frequency measurement, RPM measurement, pulse counters & timers, or a combination of all, we offer a full line of RS232 modules which can be plugged end-to-end on a single RS232 cable. Up to 32 different modules (or features) can be used on the same serial port simultaneously!

All Stackable modules incorporate two EIA/TIA-232E serial ports which communicate at 9600 baud, no parity, 8 data bits and 1 stop bit. DB9 connectors are jumpered to satisfy hardware handshaking. The port labeled ‘‘HOST’’ is configured as a DCE device and should be connected to a PC’s serial port. The port labeled ‘‘SLAVE’’ is a DTE device and can be left open, or connected to another module’s host port. Up to 32 modules can be chained together in this fashion to form a network. Either plugged together end to end, or separated by a cable.

Because a module contains two individual bi-directional ports which pass data through, it also acts as a repeater, extending the total allowable length of the RS-232 communications line.

Each Module in a network should be set to a different address using the on-board 32-position DIP switch. A module will only respond to data packets that begin with its’ own unique header character, which is determined by this DIP switch setting. Data packets transmitted by a module will also begin with this header character. The host PC can use the header character to address each individual module in a network, and to identify a module which is talking.

Modcom Software

By far, the most painless way to communicate with the Stackable Data Modules is to use ModCom; a

GUI-based HMI development tool designed specifically for these modules and written for the Windows™ operating system. Regardless of whether you plan on using ModCom as your final operational platform, or if your needs require a custom program, ModCom is so easy to use that most customers turn to it as a starting base to get a feel for the Stackable Data Modules' functionality, communications protocol, and features.



User Manual >> 

Modcom Software >> 


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