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10
Digital Communication Interface
If supplied with the option, the 7012 bath is capable of communicating with
and being controlled by other equipment through the digital interface. Two
types of digital interface are available — the RS-232 serial interface and the
IEEE-488 GPIB interface.
With a digital interface the bath may be connected to a computer or other
equipment. This allows the user to set the bath temperature, monitor the tem-
perature, and access any of the other controller functions, all using remote com-
munications equipment. In addition the heater power setting and cooling
capacity may be controlled using the interface. To enable the heater to be
switched to high using the interface the "HEATER" switch must be set to the
"LOW" position. The cooling power switch must be set to OFF to enable re-
mote control.
10.1
Serial Communications
The bath may be installed with an
RS-232 serial interface that allows
serial digital communications
over fairly long distances. With
the serial interface the user may
access any of the functions, pa-
rameters and settings discussed in
Section 9 with the exception of
the BAUD rate setting. The serial
interface uses 8 data bits, 1 stop
bit, and no parity.
10.1.1
Wiring
The serial communications cable
attaches to the bath through the
DB-9 connector at the back of the
instrument. Figure 9 shows the
pin-out of this connector and sug-
gested cable wiring. To eliminate
noise, the serial cable should be
shielded with low resistance be-
tween the connector (DB-9) and
the shield.
10.1.2
Setup
Before operation the serial inter-
face of the bath must first be set
10 Digital Communication Interface
Figure 9 Serial Communications Cable Wiring
Serial Communications
51
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