B&B Electronics VESR9xx - Fiber Models - Manual - Manual (Page 19)

Setup and Connections
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SERIAL SERVER SETUP AND CONNECTIONS
This section describes how to setup and connect VESRxx Serial Servers.
Note: In this section devices to be connected to the serial server’s serial connection are
simply referred to as the “serial device”.
CONNECTING THE POWER SUPPLY
Connect a DC power supply to the power terminals on the top of the serial server.
Polarity of the wires is indicated on the label on the side of the serial server.
Acceptable voltages are between 10 VDC and 48 VDC. The power supply must be
capable of supplying 4 Watts for VESR90x models and 6.0 Watts for VESR92x models.
CONNECTING VESR9XX SERIAL SERVERS TO SERIAL DEVICES
VESR9xx Serial Servers can be configured to connect to serial devices using RS-232,
RS-422, RS-485 2-wire and RS-485 4-wire.
RS-232 connections support eight signal lines plus Signal Ground. Signals are single
ended and referenced to Ground. Default communications parameters are 9600, 8,
N, 1 and no flow control implemented.
RS-422 connections support two signal pairs: TDA (-), TDB (+), RDA (-), RDB (+) and
GND. The data lines are differential pairs (A & B) in which the B line is positive
relative to the A line in the idle (mark) state. Ground provides a common mode
reference.
RS-485 connections support 2-wire or 4-wire operation.
When configured for 4-wire operation the connection supports two signal pairs: TDA
(-), TDB (+), RDA (-), RDB (+) and GND. This makes full-duplex operation possible. The