22 External Connectors
VX7 Reference Guide E-EQ-VX7RG-D
Printer/PC Serial Connector (COM3)
The serial connector (labeled “COM2/3”) is an industry-standard RS-232 9-pin “D” connector.
The connector and its pin assignments are shown below. By default, Pin 9 provides 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, “System Configuration”, section titled “Serial Port Pin 9” for more information on
configuring Pin 9.
Please see “Technical Specifications – Connection Cable” below for information on using a serial
cable.
1
5
96
Figure 2-4 Printer/PC Serial Connector (COM3)
Note: Power the VX7 off before attaching a cable or device to the 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 RI
or
+5VDC
Ring Indicator – Input (default)
or
Bar Code Scanner Power – 400mA max
Shell CGND Chassis Ground
