WTDOT-M - RS232 Digital IO Unit - 8 high power outputs with PWM, 2 Inputs, Counters

WTDOT-M - RS232 Digital IO Unit - 8 high power outputs with PWM, 2 Inputs, Counters
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Our Price:  £19.00(£22.80 Inc. VAT)

Digital Inputs:  2
Digital Outputs:  8


1 in stock, immediate despatch  

1 in stock, immediate despatch

8 high current open collector outputs with automatic overload shutdown. 2 wide range digital input channels with high voltage transient protection.

  • 8 high-current open-collector output channels with automatic overload shutdown.
  • 2 wide-range digital input channels with high voltage transient protection.
  • DIP switch addressable; stack up to 32 modules on the same serial port to provide 256 outputs and 64 inputs.
  • 2 event counter inputs with 24-bits each.
  • 1 quadrature encoder input with 24-bits.
  • 2 tachometer inputs which read the speed of a rotating shaft from 200 to 400,000 RPM.
  • Turn on/off relays, solenoids, DC motors, etc., including PWM drive-current control.
  • Each output incorporates a delay timer to allow momentary on/off or off/on activation.
  • An output can be used as a watchdog timer to reset the host in case of lockup.
  • Each input incorporates a pull-up resistor to 5 volts, simplifying hookup to switch contacts.
  • Responds to button presses and switch transitions using automatic debounce and typematic repeat with adjustable delay.
  • Wide power supply range (8 to 30 VDC)


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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