Digital Communication Interface
Serial Communications10
10-3
The 7341 bath is capable of communicating with and being controlled by other
equipment through the digital interface. Two types of digital interface are available - the
RS-232 serial interface which is standard and the IEEE-488 GPIB interface which is
optional.
With a digital interface the bath may be connected to a computer or other equipment.
This allows the user to set the bath temperature, monitor the temperature, and access any
of the other controller functions, all using remote communications equipment. In addition
the cooling may be controlled using the interface. To control the cooling with the
interface the cooling power switch must be ON.
Serial Communications
The RS-232 serial interface allows serial digital communications over fairly long
distances (15.24 meters). With the serial interface the user may access any of the
functions, parameters and settings discussed in Chapter 9, Controller Operation, with the
exception of the baud rate setting. The serial interface operates with eight data bits, one
stop bit, and no parity.
Wiring
The serial communications cable attaches to the bath through the DB-9 connector on the
back of the instrument. Figure 10-1 shows the pin-out of this connector and the suggested
cable wiring. To eliminate noise, the serial cable should be shielded with low resistance
between the connector (DB-9) and the shield.
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Figure 10-1. Serial Communications Cable Wiring
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