Chapter 3 Front-Panel Operation
RS-232 Interface Configuration
58
DB-25 Serial Connection If your computer or terminal has a 25-pin serial port with
a male connector, use the null-modem cable and 25-pin adapter included with the
Agilent 34398A Cable Kit. The cable and adapter pin diagram are shown below.
DTR/DSR Handshake Protocol
The power supply is configured as a DTE (Data Terminal Equipment) device and uses
the DTR (Data Terminal Ready) and DSR (Data Set Ready) lines of the RS-232
interface to handshake. The power supply uses the DTR line to send a hold-off signal.
The DTR line must be TRUE before the power supply will accept data from the
interface. When the power supply sets the DTR line FALSE, the data must cease
within 10 characters.
To disable the DTR/DSR handshake, do not connect the DTR line and tie the DSR
line to logic TRUE. If you disable the DTR/DSR handshake, also select a slower baud
rate to ensure that the data is transmitted correctly.
The power supply sets the DTR line FALSE in the following cases:
1 When the power supply’s input buffer is full (when approximately 100 characters
have been received), it sets the DTR line FALSE (pin 4 on the RS-232 connector).
When enough characters have been removed to make space in the input buffer, the
power supply sets the DTR line TRUE, unless the second case (see next) prevents this.
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
TX
RX
RTS
CTS
DSR
GND
DCD
DTR
5182-4794
Cable
5181-6641
Adapter
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
20
DB25
Female
DB25
Male
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