Amphenol Kaye CTR-40, User Manual, Page: 67 / 84

9 Digital Communication Interface
56
9.1.1 Wiring
The serial communications cable
attaches to the bath through the
DB-9 connector on the back of the
instrument. Figure 7 shows the
pin-out of this connector and the
suggested cable wiring. To elimi-
nate noise, the serial cable should
be shielded with low resistance be-
tween the connector (DB-9) and
the shield.
9.1.2 Setup
Before operation the serial inter-
face of the bath must first be set up
Instrument
Connector
(DB 9-Pin)
1 NC
2 RxD
3 TxD
4 NC
5 GND
6 NC
7 RTS
8 CTS
9 NC
RS-232 Cable Wiring for
IBM PC and Compatibles
Computer (DTE)
Connector
(DB 9-Pin)
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 NC
by programming the baud rate and
other configuration parameters.
These parameters are programmed
within the serial interface menu.
To enter the serial parameter pro-
gramming menu, press “EXIT”
while holding down “SET”, then
release both buttons to enter the
Instrument
Connector
(DB 9-Pin)
1 NC
2 RxD
3 TxD
4 NC
5 GND
6 NC
7 RTS
8 CTS
9 NC
Computer (DTE)
Connector
(DB 25-Pin)
2 TxD
3 RxD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD
20 DTR
secondary menu. Press “SET” re-
peatedly until the display reads
“
ProbE
”. This is the menu selec-
Figure 7
Serial Communications Cable Wiring
tion. Press “UP” repeatedly until the serial interface menu is indicated with
“
SErIAL
”. Finally press “SET” to enter the serial parameter menu. In the serial
interface parameters menu are the baud rate, the sample rate, the duplex mode,
and the linefeed parameter.
9.1.2.1 Baud Rate
The baud rate is the first parameter in the menu. The display prompts with the
baud rate parameter by showing “
BAUd
”. Press “SET” to choose to set the
baud rate. The current baud rate value is displayed. The baud rate of the bath
may be programmed to 300, 600, 1200, 2400, or 9600 baud. The baud rate is
pre-programmed to 9600 baud. Use “UP” or “DOWN” to change the baud rate
value. Press “SET” to set the baud to the new value or “EXIT” to abort the op-
eration and skip to the next parameter in the menu.