NXU-2B Operations Manual
2-8
2.8.3
Network Connection
The NXU-2B is connected to the Ethernet network via rear panel RJ-45 connector using a
standard Ethernet Patch Cable (one is included in the unit’s accessory kit).
2.8.4
Serial Port Connection, (RS-232)
The rear panel connector labeled
RS-232
is a standard RS-232 DCE serial port. It is a female DB-
9 connector, and can be interfaced to most PCs, typically standard DTE serial ports, using a DB-
9 straight-through serial cable.
Table 2-4
J4 Serial Port Pinout
J4 pin
Description
2
TX data
3
RX data
5
Ground
2.8.4.1
Connecting Equipment and Computers to an NXU-2B
A straight-through RS-232 serial cable is used to connect the NXU-2B to a PC serial port. In
order to connect the NXU-2B serial port to other serial devices you may need a DB-9 male-male
null modem cable, also called a crossover cable.
RS-232 serial devices are divided into two types. Devices which provide control information are
called DTE (Data Terminal Equipment) devices. Devices which accept control information are
called DCE (Data Communication Equipment) devices. In the "old days” the DTE devices were
terminals and computers, while the DCE devices were modems. The RS-232 standard specified
that DTE devices would connect to DCE devices using a straight-through cable. If you wanted
to connect two like devices (DTE to DTE or DCE to DCE) then you needed a null modem
(crossover) cable. The PC is a DTE device, and the NXU-2B and ACU products are DCE devices.
That is why you need a crossover cable for connecting other DCE serial devices to an NXU-2B
or an ACU gateway. The following drawing shows typical cable requirements for connecting
different devices to an NXU-2B. See Figure 2-3 DTE Versus DCE Serial Cables.
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