7
Digital Communication Interface
The furnace calibrator 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 optional IEEE-488 GPIB
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.
7.1
Serial Communications
The calibrator may be installed with an RS-232 serial interface that allows se-
rial digital communications over fairly long distances. With the serial interface
the user may access any of the functions, parameters and settings discussed in
Section 6 with the exception of the baud rate setting.
7.1.1
Wiring
The serial communications ca-
ble attaches to the calibrator
through the DB-9 connector at
the back of the instrument. Fig-
ure 8 shows the pin-out of this
connector and suggested cable
wiring. To eliminate noise, the
serial cable should be shielded
with low resistance between
the connector (DB-9) and the
shield.
7.1.2
Setup
Before operating the serial in-
terface, set up the BAUD rate
and other configuration param-
eters. These parameters 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
39
7 Digital Communication Interface
Serial Communications
Figure 8.
Serial Cable Wiring
