ThermoWorks 9103 HART SCIENTIFIC FIELD DRY-WELL TEMPERATURE CALIBRATORS - Manual (Page 35)

8 Digital Communication Interface
The 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 34.
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 cali-
brator through the DB-9
connector at the back of the
instrument.
Figure 5 on
page 31 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. If the unit is
used in a heavy industrial
setting, the serial cable
must be limited to ONE
METER in length.
8.1.2 Setup
Before operation the serial
interface must first be set
up by programming the
BAUD rate and other con-
figuration parameters.
These parameters are pro-
grammed within the serial
31
8 Digital Communication Interface
Serial Communications
Figure 5 Serial Cable Wiring