IEI Integration PICOe-PV-D4251_N4551_D5251 v1.00 - Manual (Page 64)

PICOe-PV-D4251/N4551/D5251 User Manual
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Figure 4-9: COM 3 Function Select Jumpers Locations
4.5.8 COM 3 RS-422 and 485 Termination Select Jumpers
Jumper Label: J3 and J4
Jumper Type: 2-pin header
Jumper Settings: See Table 4-10 and Table 4-11
Jumper Location: See Figure 4-10
The COM 3 RS-485 and RS422 Termination Select jumpers enable or disable the
termination used by the serial COM 3 communications port as 120 ohm. The COM 3
RS-485 and RS-422 Termination Select settings are shown in Table 4-10 and
Table 4-11.
RS-485 (J3) Setting Description
Short 120 ohm termination
Open No 120 ohm termination
Table 4-10: COM 3 RS-485 Termination Select Jumper Settings
RS-422 (J4) Setting Description
Short 120 ohm termination
Open No 120 ohm termination
Table 4-11: COM 3 RS-422 Termination Select Jumper Settings