X3 Operating Manual
Installing the Instrument and Plug-in Cards
Sartorius
25
3.4.4.2 PR 5510/04 RS-422/485
When mounting, the RS-485/422 interface must be configured by DIL switch S101 on the card.
Using RS-485 is compulsory with a multi-point connection (tristate status). The RS-485 interface can be
used also for point-to-point connection. Like 2-wire or 4-wire connections, this is dependent on the other
communicating units.
A 2-wire connection is half-duplex and cannot send and receive simultaneously. It requires corresponding
driver programming (see relevant instrument manual).
Factory setting
Switch S101
Settings for RS-422/ 485
1: Tristate enable:
OFF – RS-422
ON – RS-485
2: Rx enable
OFF – 4-wire
ON – 2-wire
3: Rx pull-up resistor:
OFF – not connected
ON - (RxB 1k54 +V)
4: Rx bus termination:
OFF – not connected
ON - (RxA 205E RxB)
5: Rx pull-down resistor: OFF – not connected
ON - (RxA 1k54 -V)
Overview of which switches must be closed (ON) for which mode:
Two-wire system
Four-wire system
S101
Point to point
Bus
Point to point Bus
Master RS-485
1, 2, 3, 4, 5 = on
RS-485
1, 2, 3, 4, 5 = on
RS-422
4 = on
RS-422
3, 4, 5 = on
Individual slave
RS-485
1, 2 = on
- RS-422
4 = on
-
Other slaves
-
RS-485
1, 2 = on
- RS-485
1 = on (default)
Last slave
-
RS-485
1, 2, 3, 4, 5 = on
- RS-485
1, 3, 4, 5 = on
Summary of Contents for X3 PR 5410
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