External Connectors 33
E-EQ-VX3XRG-G VX3X Reference Guide
Technical Specifications – Connection Cable
The exact serial cable is crucial. Many commercial null modem cables will not work. LXE
recommends the following cable:
Serial cable:
9000A054CBL6D9D9
1
5
9
Figure 2-5 Pinout – Serial Cable
Pinout:
DB9 female DB9 female
1 7
2 3
3 2
4 6, 8
5 5
6, 8 4
7 1
9 no connection
Some laptop devices do not properly implement all control lines on the serial port – the laptop
connection will not work.
RTS/CTS Handshaking and the Serial Port
RTS Ready to Send CTS Clear to Send
DTR Data Terminal Ready DSR Data Set Ready
Remote Side The device sending data to and receiving data from the VX3X
through the LXE serial cable connected to the RS-232 ports on
both devices.
LXE Serial Cable 9000A054CBLD9D9
The VX3X serial port supports four types of handshaking via the LXE serial cable: None,
standard Xon/Xoff, standard DTR/DSR, and a form of RTS/CTS.
To use RTS/CTS, the remote side computer must clear the DTR line which sets the VX3X CTS
line and allows the VX3X to send data to the remote side.
This allows signals and data to travel smoothly between both devices.
