B&B Electronics 232DRIO manual Connections, Opto-isolated Input black terminal blocks, Ground

Chapter 2 - Connections

Do not make any connections to the 232DRIO until you have read this chapter. Remember to power down the unit and any other connected devices before making any kinds of connections. Also be sure that the wires connected to the terminal blocks will support the voltage and current requirements of your external devices.

This chapter will cover the connections for the 232DRIO. There are four sets of connections: opto-isolated input (optional), relay outputs, serial port, and power supply.

I/O Connections

Connections to the I/O lines are made through the internal block terminals. These should clearly be labeled on the board. Refer to Table 2.1. See Chapter 5 for I/O interfacing examples.

Opto-isolated Input (black terminal blocks)

The non-polarized, opto-isolated input line is CMOS/TTL compatible and can handle voltages from 0Vdc/Vac to +30Vdc/Vac. Refer to the Specification for a complete detail.

Relay Outputs (blue terminal blocks)

The relay output lines have a maximum operating voltage of +250Vac/+125Vdc and are CMOS/TTL compatible. Refer to the Specification for a complete detail. Both relays are de-energized at factory default settings.

Ground

Connect the ground correspondingly as marked. Do not interchange the grounds for input and power. Otherwise, the input will not be optically isolated. The input is non-polarized so the input ground could be connected to either one of the black terminal while the power ground must be connected as marked on the blue terminal.

6	232DRIO-0308 Manual
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