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Serial Ports
EBX-38 Hardware Reference Manual
36
COM1/COM2/COM3/COM4 Hardware Configuration
Jumper block V1 [1-2] enables the RS-422/485 termination resistor for COM1. Jumper V1 [3-4]
enables the RS-422/485 termination resistor for COM2. Jumper block V1 [5-6] enables the RS-
422/485 termination resistor for COM3. Jumper V1 [7-8] enables the RS-422/485 termination
resistor for COM4. The termination resistor should be enabled for an RS-422 or RS-485
endpoint station; it should be disabled for RS-232 and RS-485 non-endpoint receivers. Table 1
contains jumper configuration details.
Figure 18. COM1/COM2/COM3/COM4 End-point Termination Jumpers
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