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18
JP11: COM2 Pin9 select
Pin
Function
(1-2) Closed
RI
(3-4) Closed
+5V
(5-6) Closed
+12V
JP16, JP17: COM3 Mode select
JP8
JP9
Model
(2-3)
(2-3)
RS232
(1-2)
(2-3)
RS485 Half Duplex
(1-2)
(1-2)
RS485/422 Full Duplex
JP18: Enable COM3 RS-485/422 Receiver Termination
Pin
Function
(1-2) Closed
High
(2-3) Closed
Low
JP15: COM3 Pin9 select
Pin
Function
(1-2) Closed
RI
(3-4) Closed
+5V
(5-6) Closed
+12V
JP20, JP21: COM4 Mode select
JP8
JP9
Model
(2-3)
(2-3)
RS232
(1-2)
(2-3)
RS485 Half Duplex
(1-2)
(1-2)
RS485/422 Full Duplex
JP22: Enable COM4 RS-485/422 Receiver Termination
Pin
Function
(1-2) Closed
High
(2-3) Closed
Low