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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 32.
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. The protocol for serial communi-
cations is eight data bits, one stop bit, no parity, and no flow control.
8.1.1 Wiring
The three-conductor jack for the serial port is located on the top of the instru-
ment. Figure 4 shows the pin-out of this connector. Note: The TxD line on one
side connects to the RxD line on the other and vice-versa. To reduce the possi-
bility of electrical interference, the serial cable should be shielded with low re-
sistance between the connector and the shield.
29
8 Digital Communication Interface
Serial Communications
1
2
3
4
5
6
7
8
9
RxD
TxD
GND
RxD
TxD
GND
Figure 4 Serial Cable Wiring
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