IEI Integration AFL-19i-HM55 v1.01 - Manual (Page 42)

AFL-HM55 Series Panel PC
Page 30
Figure 3-8: JP8 Jumper Setting Location
3.9.5 COM3 TX Function Select Jumper
Jumper Label: JP9
Jumper Type: 6-pin header
Jumper Settings: See Table 3-6
Jumper Location: See Figure 3-9
The COM3 TX Function Select jumper configures the TX pin on COM3 serial port
connector as RS-422 or RS-485. The COM3 TX Function Select jumper selection
options are shown in Table 3-6.
JP9 Description
Short 1 – 3 RS-422 TX-
Short 2 – 4 RS-422 TX+
Short 3 – 5 RS-485 D-
Short 4 – 6 RS-485 D+