- Hewlett-Packard Printer Owner's Manual

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The EIA-232 serial ports of the Print Master Models 706C, 708C, or
710C may have RJ-45 modular connectors. This section will address
the cabling and modular adapter information required for 700C
models with RJ-45 modular connectors. BayTech has a complete line
of RJ-45 adapters and cables that will make your installation quick
and trouble free. Call your dealer or BayTech for order information.
The 700C models with modular connectors uses the following signals
for communications:
RJ-45 PIN-OUT INFORMATION
PIN SIGNAL DIRECTION DESCRIPTION
1 RTS Output Handshake out, Normally +10V
2 DTR Output Handshake out, enable/disable the inputting of
characters
3 TX Output Transmit Data
4 GND ---- Signal Ground
5 GND ---- Signal Ground
6 RX Input Receive Data
7 CTS Input Handshake In, enable/disable the outputting of
characters
8 DSR Input Handshake In, not used.
Following are drawings of a RJ-45 receptacle and plug. The pin
number assignments are given.