28
Module Description
3.10 Setting RS485/RS422 Termination
If the COM ports are used in RS485/RS422 modes, the termination resistors must be switched
on. These are located at DIP-Switches SW2 and SW3 (SW4 is for BIOS configuration. See
note.) The default setting is “OFF” (RS232-Mode) as illustrated in the following table.
Table 3-12: SW2 and SW3 RS485/RS422 Signal Definitions
Position
Position
Signal(s)
Function
1
8
SW2: COM0-TX
SW3: COM2-TX
Pos. 1: TX-termination off
Pos. 8: TX-termination on
2
7
SW2: COM0-RX
SW3: COM2-RX
Pos. 2: RX-termination off
Pos. 7: RX-termination on
3
6
SW2: COM1-TX
SW3: COM34-TX
Pos. 3: TX-termination off
Pos. 6: TX-termination on
4
5
SW2: COM1-RX
SW3: COM3-RX
Pos. 4: RX-termination off
Pos. 5: RX-termination on
DIP-Switches
The shaded table cells signify the default positions. Refer to Chapter 4 for the
definition of the SW4 switch.
SW3
SW4
SW2
Содержание CM1-BT1
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