B&B Electronics VESR9xx - Fiber Models - Manual - Manual (Page 21)

Setup and Connections
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The VESR902T-x has two serial connections that support RS-232, RS-422 and RS-485
(2- and 4-wire). The unit has two connectors, both of which are 5-position terminal
blocks. Make the appropriate connections to the terminal blocks to match the serial
connection mode you select when configuring the serial server.
Note: Refer to Appendix D for connector pinout information.
Figure 13. VESR902T-x Connections
CONNECTING THE VESR902D-X
The VESR902D-x has two serial connections that support RS-232, RS-422 and RS-485
(2- and 4-wire). The unit has two connectors, both of which are DB-9M connectors.
You must connect the serial device to the serial server via a serial cable. The
VESR902D is a DTE. If the serial device is a DTE, use a null modem (cross-over) cable.
If the serial device is a DCE, use a straight-through cable.
Note: Refer to Appendix D for connector pinout information.