H1770M Modbus 64-bit Digital I/O Board


The H1770M Modbus digital I/O board contains sixty-four discrete digital input/output bits. The input or output direction of each digital bit is user-selectable and may be set individually or all at once.

Available on backorder


The H1770M digital I/O boards provide a direct interface to industry-standard mounting racks and solid-state relay I/O modules. Mounting racks such as the PB16 can be controlled directly with the H1770M boards.

The status of the digital inputs and outputs is communicated to the host using either the Modbus RTU or DGH ASCII serial protocol using the jumper selectable RS-232 or RS-485 serial interface.

Note: Please contact our factory about ribbon connector latch options before ordering the H1770M

Additional information


• Digital inputs and outputs via RS-232 or RS-485.
• Connect to solid state relays to sense AC and DC voltages.
• User defines any bit as input or output.
• Control digital I/O bits individually or all at once.
• No software initialization required – I/O startup stored in EEPROM.
• 64 discrete digital input/output bits.
• Communications Watchdog Timer for Digital Outputs.
• Modbus RTU Serial Protocol. • Interface with industry standard I/O modules and racks.

Sensor Type

Digital I/O



RS-485 Only


Modbus Register Map

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