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7 Digital Communications Interface
7.1 Overview
The communication feature allows an external device, such as a computer, to com-
municate with the 1529 to obtain measurement data and control operating conditions.
Communication is accomplished by issuing commands to the 1529 through RS-232 or
IEEE-488 communication ports.
7.2 Communications
The thermometer readout is equipped with an RS-232 serial interface, and optionally
a GPIB port. The serial interface allows communications up to distances of approxi-
mately 50 feet. The serial interface and GPIB port allow the user to access the func-
tions, parameters, and settings discussed in Section 6, Menu Functions on page 23.
7.2.1
Serial Wiring
The serial communications cable attaches to the thermometer readout through the
DB-9 connector at the back of the instrument. Figure 48 on next page shows the
pin-out of this connector and suggested cable wiring. This type of cable is typically
referred to as a "null modem" cable. To eliminate noise, the serial cable should be
shielded with low resistance between the connector (DB9) and the shield.
Digital Communications Interface
Communications
67
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