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10.1.1
Wiring
The serial communications ca-
ble attaches to the bath through
the DB-9 connector at the back
of the instrument. Figure 9
shows the pin-out of this con-
nector and suggested cable wir-
ing. To eliminate noise, the
serial cable should be shielded
with low resistance between the
connector (DB-9) and the
shield.
10.1.2
Setup
Before operation the serial in-
terface of the bath must first be
set up by programming the
baud rate and other configura-
tion parameters. These parame-
ters are programmed within the
serial interface menu.
To enter the serial parameter
programming mode first press
“EXIT” while pressing “SET”
and release to enter the second-
ary menu. Press “SET” repeat-
edly until the display reads
“ProbE”
. This is the menu se-
lection. 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.
10.1.2.1
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
serial communications may be programmed to 300,600,1200, or 2400 baud.
The baud rate is pre-programmed to 1200 baud. Use “UP” or “DOWN” to
change the baud rate value. Press “SET” to set the baud rate to the new value or
“EXIT” to abort the operation and skip to the next parameter in the menu.
10.1.2.2
Sample Period
The sample period is the next parameter in the menu and prompted with
“SAm-
6020 Series Calibration Bath
User’s Guide
54
Figure 9
Serial Communications Cable Wiring