The H1700 digital I/O boards provide computer monitoring and control of devices through solid state relays or TTL signals. The status of the digital inputs and outputs is communicated to the host using the DGH serial ASCII protocol using the jumper selectable RS-232 or RS-485 serial interface.

Each H1700 contains up to 64 bits of digital inputs and outputs. The input or output direction of each digital bit may be set by the user individually or all at once. The digital outputs are open-collector transistor switches that may be used to control solid-state relays which in turn may control heaters, pumps and other power equipment. The digital output bits can sink up to 15mA without damage. The digital inputs will accept signals up to +0-5Vdc without damage.

Many industrial applications require a ‘safe’ start-up condition to prevent accidents at critical points in the process. Each H1700 contains an initial start-up value which is used to configure the digital outputs on power up. The initial value is user selectable and stored in EEPROM. Since each digital output is automatically configured on start-up, no software initialization routines are required.

All user selectable options (address, baud rate, etc.) are done through the communications port and are stored in nonvolatile EEPROM memory.

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