10 Digital Communication Interface; Serial Communications; Wiring; Setup - Fluke 7103 User Manual

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
interface parameters menu are the BAUD rate, the sample rate, the duplex mode, and
the linefeed parameter.
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Digital Communication Interface
Serial Communications
RS-232 Cable Wiring for
IBM PC and Compatibles
Instrument
Connector
(DB 9-Pin)
1 NC
2 RxD
3 TxD
4 NC
5 GND
6 NC
7 RTS
8 CTS
9 NC
Instrument
Connector
(DB 9-Pin)
1 NC
2 RxD
3 TxD
4 NC
5 GND
6 NC
7 RTS
8 CTS
9 NC

Figure 8 Serial Cable Wiring

1.877.766.5412
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Computer (DTE)
Connector
(DB 9-Pin)
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 NC
Computer (DTE)
Connector
(DB 25-Pin)
2 TxD
3 RxD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD
20 DTR
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