AC112Q-3, AC125Q-3, AC150Q-3, and AC165Q-3 Operations Manual.... 37
6.5
REMOTE COMMUNICATIONS, cont.
6.5.1 RS-232C/SCPI
The RS-232C serial port is located in the upper-left corner of the Input/Output connection panel
(see Figure 4).
The RS-232C TxD signal originating in the converter is approxi15V when “High” and -
15V when “Low.” The RS-232C GND (ground) wire is connected to the low voltage DC common
of the converter power supply system, which is normally also connected to the chassis-ground of
the converter. When the Metering Isolation Option is installed in the converter, the link to the
chassis ground is removed.
The RS-232C serial port is a DE9S (female, 9-pin D-subminiature connector). The pinout of the
connector is standard for an RS-232C DCE. Figure 6 below demonstrates connection from a DCE
to a DTE. Use of a shielded, jacketed, four-wire (two twisted pairs), color-coded cable for each
converter in the system is required.
Figure 6: RS-232C PINOUT
