User Manual

TMCM-351 Hardware Manual (V1.06 / 2011-NOV-14) 17

4.3 Jumpers

Most settings of the board are done through the software. Nevertheless, a few jumpers are available for

configuration.

RS485 bus

termination

RS232/RS485

interface

selection

CAN bus

termination

Encoder input termination Enable all driver stages

Figure 4.10: Configuration with jumpers

4.3.1 J1: RS485 bus termination

The board includes a 120 Ohm resistor for proper bus termination of the RS485 interface. When this jumper

is closed, the resistor will be placed between the two differential bus lines RS485+ and RS485-.

4.3.2 J2: RS232 / RS485 interface selection

This 3-pin single row header is used for selecting one of two desired serial interfaces: RS232 or RS485 using

a jumper:

RS 232 interface

selection

RS 485 interface

selection

Figure 4.11: RS232/RS485 interface selection