ThermoWorks 9141 HART SCIENTIFIC FIELD DRY-WELL TEMPERATURE CALIBRATORS - Manual (Page 36)

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
Section7
with the exception of the BAUD rate setting.
8.1.1 Wiring
The serial communications ca-
ble attaches to the calibrator
through the D-9 connector at
the back of the instrument. Fig-
ure 6 shows the pin-out of this
connector and suggested cable
wiring. The serial cable should
be shielded. If the unit is used
in a heavy industrial setting, the
serial cable must be limited to
ONE meter.
8.1.2 Setup
Before operation the serial in-
terface must first be set up by
programming the BAUD rate
and other configuration param-
eters. These parameters are pro-
grammed within the serial
interface menu. The serial inter-
face parameters menu is out-
lined in
Figure 5 on page 22.
To enter the serial parameter
programming mode first press
“EXIT” while pressing “SET”
and release to enter the second-
33
8 Digital Communication Interface
Serial Communications
Figure 6 Serial Cable Wiring