Tektronix DMM4040

C-1
Appendix C
RS-232 Port Connections
Introduction
Table C-1 lists the pins and related signals available through the RS-232 port.
Table C-1. RS-232 Pin to Signal List
Pin Name Usage
1 DCD Not used
2 RX Receive data
3 TX Transmit data
4 DTR Not used
5 GND Signal ground
6 DSR Not used
7 RTS Request to send
8 CTS Clear to send
9 RI Not used
The Meter’s RS-232 control lines can be rewired to an alternate pairing instead of the
RTS/CTS control pair. This alteration should be done by a trained technician at a
Tektronix service center. Opening the cover of the Meter to make this alteration may void
the Meter’s warranty.