User Manual

TMCM-1311 V1.2 Hardware Manual (Rev. 1.12 / 2013-JUL-05) 12
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3.2.8 CAN / RS485 Connector
The TMCM-1311 offers one 9-pin male D-SUB connector for CAN and RS485 communication. An on-board
bi-stable relay allows switching between CAN and RS485 connector pin-assignment in software. This bi-
stable relay remembers its state even when un-powered. Hence, the configuration of the pin-assignment
for either CAN or RS485 has to be done only once.
3.2.8.1 CAN Connector
If selected, a CAN 2.0B interface is available via the on-board 9-pin male D-SUB connector. Only three pins
of the connector are used. The pin assignment of these three pins is in accordance with the CiA Draft
Recommendation Part 1: Cabling and connector pin assignment.
5
1
6
9
Pin
Label
Direction
Description
1
2
CAN_L
Bi-directional
Differential CAN bus signal (inverting)
3
GND
Power (GND)
Signal and system ground
4
5
6
7
CAN_H
Bi-directional
Differential CAN bus signal (non-inverting)
8
9
Table 3.10 CAN connector
3.2.8.2 RS485 Connector
If selected, an RS485 interface is available via the 9-pin male D-SUB connector. The module supports 2-
wire RS485 communication. Only three pins of the connector are used.
5
1
6
9
Pin
Label
Direction
Description
1
2
RS485-
Bi-directional
Differential RS485 bus signal (inverting)
3
GND
Power (GND)
Signal and system ground
4
5
6
7
RS485+
Bi-directional
Differential RS485 bus signal (non-inverting)
8
9
Table 3.11 RS485 connector