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31
Digital Communication Interface
RS-232 Connection
7 Digital Communication Interface
This instrument 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 next page.
7.1 RS-232 Connection
The three-conductor jack for the serial port is located on the back of the instrument.
One serial cable is included. Additional or longer cables, of three meters or less, can
be constructed by following the wiring diagram shown in Figure . Note: The TxD
line on one side connects to the RxD line on the other and vice-versa. To reduce the
possibility of electrical interference, the serial cable should be shielded with low
resistance between the connector and the shield and should not be much longer than
is necessary. The protocol for serial communications is 8 data bits, 1 stop bit, and no
parity. Use no ow control. Set the linefeed to ON (all carriage returns are followed by
a linefeed (ASCII decimal 10)), and the duplex to HALF, disabling echo.
Figure 6
1
2
3
4
5
6
7
8
9
RxD
TxD
GND
RxD
TxD
GND
Serial cable wiring
1.888.610.7664 sales@GlobalTestSupply.com
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