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1. Pin 1-2 jumper setting is short by default,
Auto Detect / RS-485(2-Wire)
This COM port can automatically detect
the state of RS-422 full duplex or RS-485
half duplex and control the data
transmitting and receiving wires at the same
port.
2. Pin 2-3 jumper setting is short for RS-422/
RS-485(4-Wire)
This COM port forces to run RS-422 full
duplex mode.
Figure 4: ID-P20211-S1 Pin Assignment