HP 24SII - Manual (Page 24)

The standard Model 24SII DES requires 115 VAC, 50/60 Hz. power
and comes with a three-prong power cord. Do not attempt to operate
the unit with a two-prong socket or adaptor. 230 VAC, 50/60 Hz. is
optional.
The Model 24SII DES powers-up when you press the power switch,
located on the front of the unit, to "ON". A green LED on the front
panel will illuminate when power is applied.
CAUTION: Power should be turned off anytime cables are to be
installed or removed. Make sure the power is turned off and the unit is
unplugged before removing the cover and attempting to make any
internal changes.
Before you proceed with cabling, determine which type of I/O modules
you have installed on the Model 24SII. The module type is marked on
the top of the module panel. Parallel ports have DB-25 female
connectors. Serial ports have either DB-25 male DTE, DB-25 female
DCE, or RJ-45 modular connectors. Next, determine what device will
be connected to each available port, whether the device will be
connected to a serial or parallel port, and whether the device will
connect to a computer port or printer port. Finally, you should obtain
the correct cables to connect your equipment to the Model 24SII.
NOTE: Any port (except Port 1 of Module 1) may be designated as a
computer port or a printer port. However, if computer-to-computer
communication will be required, the computers that will be
communicating must both be connected to serial ports to allow full
duplex communication. Printers and plotters are connected via cable
to user-assigned printer ports on the Model 24SII DES. Computers
and modems are connected via cable to user-assigned computer
ports.
NOTE: If you are interfacing your equipment to the M24SII-V07 I/O
module, determine if you will use 4-wire or 8-wire cabling.
Refer to Section 5 and Appendix A to ensure you have all the correct
cables to fully connect your system.