38
Teledyne API Model 480M O
3
Monitor User Manual
09420A DCN8343
6.2. SERIAL CONFIGURATION - RS-232 AND RS-485
The RS-232 or RS-485 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 serial configuration is MODBUS RTU. For
details on the MODBUS RTU specification, please see
The serial port setup for RS-232/RS-485 configuration is shown in Table 6-1 below:
Table 6-1. RS-232/RS-485 Port Setup
Property
Value
Baud Rate
57600
Data Bits
8
Parity
None
Stop Bits
1
Flow Control
None
To change or verify the configuration of the serial COM, refer to Figure 6.1 while
performing the following instructions:
1.
Disconnect power from the monitor.
2.
Open front panel.
3.
Locate J20 and J23 connectors on the Mainboard PCA (remove Relay
expansion board if installed as indicated in Figure 3-5).
4.
Set the desired COM as shown in 6.1 where:
•
for RS-232 Normal, jumper Pins 1-2 on both J20 and J23, or
•
for RS-485, jumper Pins 3-4 on both J20 and J23.
5.
Re-secure the front panel.
6.
Reconnect power to the monitor.
If there is a problem with the connection, it’s possible that the pinout signals on the
RS-232 connector, need to be changed to accommodate the serial cable pins. In that
case, refer to Figure 6-1 to make the adjustments for 232 XSED OVER by setting
the jumper pins 2-3 on both J20 and J23.
