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P/N 06160D DCN6409 Teledyne API Model 465M O
3
Monitor Instruction Manual - Page 45
8.3. RS-232 Configuration
The RS-232 configuration is usually used when making a one-to-one connection between
the instrument and a single computer or PLC. The communications protocol used for the
RS-232 configuration is MODBUS RTU. For details on the MODBUS RTU
specification, please see http://www.modbus.org/.
With the instrument configured for RS-232, connection can be made to the DB-9
connector, labeled “RS232/485”, or to the three “COM” pins on the “General I/O”
connector. Only one of these connections should be used, the other must be left un-
connected. Table 8-1 below details the pinouts of these two connectors:
Table 8-1: RS-232 Connector Details
Function DB-9
Connector Pin
(SW2 – DTE)
DB-9
Connector Pin
(SW2 – DCE)
General I/O
Connector
Transmit (Tx) 3 2 ‘T’
Receive (Rx) 2 3 ‘R’
Ground 5 5 ‘G’
The serial port setup for RS-232 configuration is shown in Table 8-2 below:
Table 8-2: RS-232 Port Setup
Property Value
Baud Rate 57600
Data Bits 8
Parity None
Stop Bits 1
Flow Control None
NOTE
A DTE-DCE switch is provided so that the instrument can be
connected to another device using either a straight-through or
crossover (Null-Modem) cable. See Section 8.2 for details on
changing this configuration.