AC25/30QTP-1 and -3 Operations Manual.... 40
6.5.1 RS-232C/SCPI
The RS-232C serial port is located to the right of the CONVERTER POWER output connections
on the converter side wall (see Figure 4 on page 21).
The RS-232C TxD signal originating in the converter is approximately +15V 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 7 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 9: RS-232C PINOUT
It is strongly recommended that an RS-232C optical isolation be included in any RS-232C/SCPI
protocol integration to avoid the creation of ground-loops and ground-fault paths through the
remote communication port; such isolation is not included with the standard product.
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