Manual

Rear I/O Modules CP346
Page 5 - 16 © 2005 Kontron Modular Computers GmbH ID 27253, Rev. 03
P R E L I M I N A R Y
5.2.4 RS485 Termination Jumpers
The CP-RIO3-46-OPT offers onboard one 120 ohm termination resistor per channel which can
be used to terminate the differential line pairs in case the serial channel is a beginning or end
node of a RS485 two-wire network.
19 TRxD+ 3 3
44 TRxD- 8
20 — —
45 — —
21 — 1
46 — 6
22 — —
47 — —
23 — 7
48 — 4
24 GND 5
49 — 2
25 — —
50 —
Table 5-6: Termination Jumper Settings for CP-RIO3-46-OPT
CHANNEL
SETTING DESCRIPTION
0 1 2 3
J1 J3 J5 J7
Open
(default)
No 120 ohm termination
Set
120 ohm termination between the differential lines
Termination between TRXD± in half duplex mode.
Table 5-5: Pinouts of Front Panel Adapter Connectors (Sheet 2 of 2)
50-Pin Row
Connector
RS422/RS485
Half Duplex
9-Pin Row
Connectors
Channel