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E.1
COM1/ COM2/ COM3: RS-232
Pin Definition
COM1/ COM2/ COM3
Pin
Signal
1
NDCD
2
NRX
3
NTX
4
NDTR
5
GND
6
NDSR
7
NRTS
8
NCTS
9
NRI
E.2
COM4(Option): RS-422/ 485
The serial port COM4 on the TPC-1840 series are adjustable by BIOS. It can be set
to RS-422 or RS-485 mode. This port is designed with auto data flow control capabil-
ity.In other words, the TPC-1840 series can automatically detect the data flow direc-
tion at this port when the two wired RS-485 communication is activated.
Pin Definition
COM 4
Pin
1
2
3
4
5
6
7
8
9
TPC-XX40 User Manual
Signal
RS-422
RS-485
TX-
D-
TX+
D+
Rx+
–
Rx-
–
GND
GND
–
–
–
–
–
–
–
–
42
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