32 External Connectors
VX3X Reference Guide E-EQ-VX3XRG-G
RS-232 Connector (COM1 or COM3)
When present, the serial connector, labeled “RS-232”, (configured as COM3) is industry-standard
RS-232. The connector includes a PC/AT standard 9–pin “D” male connector. By default, Pin 9
to provide RI. Pin 9 may also be configured to supply +5 VDC at 0.4A (max) for an external bar
code scanner. Refer to Chapter 4, “Scanner”, section titled “Serial Port Pin 9” for more
information on configuring Pin 9.
If Pin 9 is powered off, please see “Technical Specifications – Connection Cable” in the following
section for information on using a serial cable.
1
5
96
Figure 2-4 Scanner Serial Connector (COM3)
Note: Power the VX3X off before attaching a cable or device to the COM1 or COM3 serial
port.
Pinout
Pin Signal Description
1 DCD Data Carrier Detect – Input
2 RXD Receive Data – Input
3 TXD Transmit Data – Output
4 DTR Data Terminal Ready – Output
5 GND Signal/Power Ground
6 DSR Data Set Ready – Input
7 RTS Request to Send – Output
8 CTS Clear to Send – Input
9 +5VDC
or
RI
Barcode Scanner Power – 400mA max (Default)
or
Ring Indicator – Input
Shell CGND Chassis Ground
