Keithley 2701

Model 2701 User’s Manual Remote Operations 10-33
Table 10-5 provides pinout identification for the 9-pin (DB-9) or 25-pin (DB-25) serial
port connector on the computer (PC).
Error messages
See Appendix C for RS-232 error messages (+800 through +808).
Table 10-5
PC serial port pinout
Signal DB-9 pin # DB-25 pin #
DCD, data carrier detect 1 8
RXD, receive data 2 3
TXD, transmit data 3 2
DTR, data terminal ready 4 20
GND, signal ground 5 7
DSR, data set ready 6 6
RTS, request to send 7 4
CTS, clear to send 8 5
RI, ring indicator 9 22