Rs-485 Configuration; Table 8-3: Rs-485 Connector Details; Table 8-4: Rs-485 Port Setup - Teledyne 465L Operation Manual

Teledyne API Model 465L O 3 Monitor Operation Manual
8.4.

RS-485 Configuration

RS-485 is commonly used for factory automation busses with a computer or PLC
acting as a master. The communications protocol used for the RS-485 configuration
is MODBUS RTU. For details on the MODBUS RTU specification, please see
http://www.modbus.org/.
With the instrument configured for RS-485, connection can be made to the DB-9
connector, labeled "RS232/485", or to the three "COM" pins on the "General I/O"
connector. Table 8-3 below details the pinouts of these two connectors:
Note that for RS-485, the DTE-DCE switch should always be set to DCE. See
Section 8.2 for details on changing this configuration.
The serial port setup for RS-485 configuration is shown in Table 8-4 below:
56

Table 8-3: RS-485 Connector Details

Function DB-9
Connector Pin
(SW2 – DCE)
RS485 - A 2
RS485 - B 3
Ground 5

Table 8-4: RS-485 Port Setup

Property
Baud Rate
Data Bits
Parity
Stop Bits
Flow Control
Teledyne API Model 465L O
General I/O
Connector
'T'
'R'
'G'
Value
57600
8
None
1
None
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