Chapter 3 Front-Panel Operation and Features
RS-232 Interface Reference
65
3
Connection to a Computer or Terminal
To connect the power supply to a computer or terminal, you must have the proper
interface cable. Most computers and terminals are DTE (Data Terminal Equipment)
devices. Since the power supply is also a DTE device, you must use a DTE-to-DTE
interface cable. These cables are also called null-modem, modem-eliminator, or
crossover cables.
The interface cable must also have the proper connector on each end and the internal
wiring must be correct. Connectors typically have 9 pins (DB-9 connector) or 25 pins
(DB-25 connector) with a “male” or “female” pin configuration. A male connector
has pins inside the connector shell and a female connector has holes inside the
connector shell.
If you cannot find the correct cable for your configuration, you may have to use a
wiring adapter. If you are using a DTE-to-DTE cable, make sure the adapter is a
“straight-through” type. Typical adapters include gender changers, null-modem
adapters, and DB-9 to DB-25 adapters.
The cable and adapter diagrams shown below can be used to connect the power supply
to most computers or terminals. If your configuration is different than those described,
order the Agilent 34399A Adapter Kit. This kit contains adapters for connection to
other computers, terminals, and modems. Instructions and pin diagrams are included
with the adapter kit.
DB-9 Serial Connection If your computer or terminal has a 9-pin serial port with
a male connector, use the null-modem cable included with the Agilent 34398A Cable
Kit. This cable has a 9-pin female connector on each end. The cable pin diagram is
shown below.
Instrument
PC
DB9
Male
DB9
Female
DB9
Female
DB9
Male
DCD
RX
TX
DTR
1
2
3
4
5
6
7
8
9
GND
DSR
RTS
CTS
RI
1
2
3
4
5
6
7
8
9
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
5182-4794
Cable
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