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MANUAL P/N 316005 REV: B
Chapter 8 - The RS-485 Module
8.1 Introduction
The RS-485 communications option for the Series 316 Vacuum Gauge Controller permits data output to a
host computer using RS-485 digital communications. Communications handshake is by a command-
response mechanism.
A variety of baud rates and byte framing options are available. The RS-485 byte format is configured to your
system requirements using configuration switches located on the option board. These switches are accessed
by removing the controller top chassis cover.
The RS-485 factory defaults are 9600 BAUD, 8 character bits, no parity, 1 stop bit, Address = 01
Internal switches are read upon power up. Changes in settings will take effect upon next power-up cycle.
8.2 RS-485 Installation
8.2.1 RS-485 Address
The address dial on the RS-485 module on the back of the controller and Switch S1 determine the
controller’s base RS-485 address. Switches S1.1 to S1.4 are used for Address offsets. This address can be
any hex code from 00 to FF.
The address dial on the RS-485 module on the back of the controller determines the value of the least
significant digit and the S1 switches determine the value of the most significant digit. The S1 switch positions
are binary and the weight of each switch when OFF is given below.
To prevent data contentions, no two RS-485 nodes should be set with the same address. It is not
recommended that address 00 be used because some manufacturers use this address for configuration.
Figure 8-1 Back Panel and Top View of RS-485 Module
Switch Weight Setting when OFF
Switch
Weight
S1.1
10 Hex
S1.2
20 Hex
S1.3
40 Hex
S1.4
80 Hex
Содержание Granville-Phillips Convectron 316 Series
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