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10 Digital Communication Interface
The Micro-Bath calibrator is capable of communicating with and being con trolled 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 5
on page 46.
10.1
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 9 with the
exception of the baud rate setting.
10.1.1
Wiring
The serial communications cable
attaches to the calibrator through the
DB-9 connector at the back of the
instrument. Figure 8 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.
10.1.2
Setup
Before operation the serial inter face must
first be set up by pro gramming the baud
rate and other configuration parameters.
These parameters are programmed
within the serial interface menu. The
serial interface parameters menu is
outlined in Figure 7 on page 32.
To enter the serial parameter pro gramming mode first press "EXIT" while pressing
"SET" and release to enter the secondary menu. Press "SET" re peatedly until
the display reads "PAr". Press "UP" until the serial interface menu is indicated
with"SErIAL". Finally press "SET" to enter the serial pa rameter menu. In the serial
Digital Communication Interface
Serial Communications
Figure 8 Serial Cable Wiring
43
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