CJB CJ ISA-E5, User Manual, Page: 30 / 90

22 ISA-E5 User`s Manual
COM1 Serial Port
COM1, a 9-pin D-Sub male connector, is the onboard COM1 serial
port of the ISA-E5. The following table shows its pin assignments.
Pin # RS232 Mode
Signal Name
1 DCD, Data carrier detect
2 RXD, Receive data
3 TXD, Transmit data
4 DTR, Data terminal ready
5 GND, ground
6 DSR, Data set ready
7 RTS, Request to send
8 CTS, Clear to send
9 +5V,Ring-IN or +12V
COM2 Serial Port
COM2, a 10-pin header connector, is the onboard COM2 serial port of
the ISA-E5. The following table shows its pin assignments while it is
configured as RS-232, RS-422 or RS-485 interface.
Pin #
RS232 Mode
Signal Name RS422/RS485 Mode
Signal Name
1 DCD, Data carrier detect
TX- (422/485)
2 RXD, Receive data TX+ (422/485)
3 TXD, Transmit data RX+ (422)
4 DTR, Data terminal ready RX- (422)
5 GND, ground
GND
6 DSR, Data set ready
N.C.
7 RTS, Request to send N.C.
8 CTS, Clear to send N.C.
9 +5V,Ring-IN or +12V
N.C.
10 N.C. N.C.