New Transducers TR-5001 - Manual (Page 42)

COM1 Serial Port
COM1, a 10-pin header connector , is the onboard COM1 serial port of
the TR-979. The following table shows its pin assignments.
Pin # 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 RI, Ring indicator
10 N.C.
COM2 Serial Port
COM2, a 10-pin header connector, is the onboard COM2 serial port of
the TR-979. 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 RI, Ring indicator N.C.
10 N.C. N.C.
38 TR-5001 User Manual