Programmable I/O Modules Ride The Modbus

The DGH 1700M series digital I/O products, which enable computer monitoring and control through solid-state relays or TTL signals, send input and output status to the host in Modbus RTU protocol via RS-232 or RS-485. The input or output direction of each digital bit can be set individually or all at once. The series includes the D1711M/D1712 15-channel digital I/O modules with RS-232/-485 outputs and the 24-channel H1750M and 64-channel H1770 24 digital I/O boards with both RS-232 and RS-485 outputs. Users can connect up to 247 boards and modules on one twisted pair using RS-485 and the series is compatible with all industry-standard, solid-state relay modules and mounting boards. Single-unit pricing is $275 each for the D1711M/D1712M/H1750M and $350 for the H1770M. DGH CORP., Manchester, NH. (603) 622-0452.