B&B Electronics 485SDD16 Data Aquisition Module.

RS-485 Digital I/O Module

Used. Still works great

From the manufacturer:

"The 485SDD16 is a general purpose control module that

operates through an RS-485 interface. The 485SDD16 offers 16

discrete digital I/O lines. With these features, the module can be

used to sense external ON/OFF conditions and to control a variety

of devices.

Each of the sixteen I/O lines can be defined as either an input or

an output. The digital outputs are CMOS compatible. The digital

inputs are CMOS/TTL compatible. The digital I/O lines are available

through a DB-25S (female) connector.

The 485SDD16 connects to the host computer’s RS-485 or RS-

422 serial port using terminal blocks. The address and turn-around

delay are software programmable to allow for use of multiple

devices or connection to existing multi-node systems. The unit

automatically detects baud rates from 1200 to 9600. A data format

of 8 data bits, 1 stop bit and no parity is used.

Configuration parameters are stored in non-volatile memory.

These parameters consists of module address, communication turn-

around delay, I/O definitions, and output power-up states.

The unit is powered by connecting +12Vdc to terminal blocks or

to the DB-25S I/O connector."