Modem Cards; Rs232 And Rs485 - Emerson Rosemount 2460 System Hub Reference Manual

Service and Troubleshooting
October 2018
6.27

Modem cards

6.27.1

RS232 and RS485

The RS232/485 modem card (see
communication. Four switches are available to configure the card as specified in
In case the card is configured for RS485 communication, the terminator must be activated (ON) when
the Rosemount
Table 6-6. Configuration switches
1. When using the RS-232 interface the RS-485 termination switches (S3 and S4) must be
in OFF state
2. Both S3 and S4 must be in ON or OFF state for proper termination or no termination
Note
Both the switches must be either ON or OFF position for proper operation and indication.
RS-232
Table 6-7. Configuration switches when using RS-232 communication
1. When using the RS-232 interface the RS-485 termination switches (S3 and S4) must be
in OFF state
RS-485
Table 6-8. Configuration switches when using RS-485 communication
1. Both S3 and S4 must be in ON or OFF state for proper termination or no termination
148
™
2460 is the last device on the bus.
Switch Description
S1 RS-485 and RS-232
S2 RS-485 operation mode Half/Full Duplex
(2)
S3 RS-485 termination ON/OFF (High side)
(2)
S4 RS-485 termination ON/OFF (Low side)
Switch RS-232 communication
S1 RS-232 (ON)
S2 (not applicable for RS-232)
(1)
S3 OFF (RS-485 termination High side)
(1)
S4 OFF (RS-485 termination Low side)
Switch RS-232 communication
S1 RS-485 (OFF)
S2 RS-485 operation mode Half/Full Duplex
(1)
S3 RS-485 termination ON/OFF (High side)
(1)
S4 RS-485 termination ON/OFF (Low side)
Figure 6-9 on page 149) can be used for RS232 or RS485
(1)
selection
Reference Manual
00809-0100-2460, Rev DE
Table 6-6.
Service and Troubleshooting