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8 Digital Communication Interface
The dry-well calibrator is capable of communicating with and being controlled
by other equipment through the digital serial interface.
With a digital interface the instrument may be connected to a computer or other
equipment. This allows the user to set the set-point temperature, monitor the
temperature, and access any of the other controller functions, all using remote
communications equipment. Communications commands are summarized in
Table 2 on page 36.
8.1 Serial Communications
The calibrator is installed with an RS-232 serial interface that allows serial dig
-
ital communications over fairly long distances. With the serial interface the user
may access any of the functions, parameters and settings discussed in Section 7
with the exception of the BAUD rate setting.
8.1.1 Wiring
The serial communications cable attaches to the calibrator through the D-9 con-
nector at the back of the instrument. Figure 6 shows the pin-out of this connec-
tor and suggested cable wiring. The serial cable should be shielded. If the unit
is used in a heavy industrial setting
the shielded cable must be limited to
ONE meter.
8.1.2 Setup
Before operation the serial interface
must first be set up by programming
the BAUD rate and other configura
-
tion parameters. These parameters are
programmed within the serial inter
-
face menu. The serial interface pa
-
rameters menu is outlined in Figure 4
on page 22.
To enter the serial parameter program
-
ming mode first press “EXIT” while
pressing “SET” and release to enter
the secondary menu. Press “SET” re
-
peatedly until the display reads
“CAL”. Press “UP” until the serial in
-
terface menu is indicated with “SE
-
rIAL”. Finally press “SET” to enter
the serial parameter menu. In the se
-
33
8 Digital Communication Interface
Serial Communications
Figure 6 Serial Cable Wiring