5520A
Operators Manual
5-6
RS-232 The SERIAL 1 FROM HOST serial port connects the PC and Calibrator, while
the SERIAL 2 TO UUT serial port acts as a pass-through port, passing commands from
the PC to UUT via the Calibrator. You can write your own computer programs using the
command set, or operate the PC as a terminal and enter individual commands, or you can
purchase optional Fluke MET/CAL or 5520/CAL software for RS-232 system
operations. Typical RS-232 remote configurations are shown in Figure 5-2.
After configuring the IEEE-488 or RS-232 port for remote operation, you are ready to
begin using the command set. The operation of the command set is described under
“Using Commands” in this chapter. A summary of remote commands is in Chapter 6,
“Remote Commands.”
5-2. Setting up the IEEE-488 Port for Remote Control
The Calibrator is fully programmable for use on the IEEE Standard 488.1 interface bus.
The IEEE-488 interface is also designed in compliance with supplemental standard
IEEE-488.2, which describes additional IEEE-488 features. Devices connected to the
IEEE-488 bus are designated as talkers, listeners, talker/listeners, or controllers. Under
remote control of an instrument, the Calibrator operates as a talker/listener.
A PC equipped with an IEEE-488 interface, controls the the Calibrator. Compatible
software for IEEE-488 operation may be purchased from Fluke, including METCAL and
METRACK. Another software package, 5520/CAL, is also available but operates only
on the RS-232 serial interface.
When using the IEEE-488 remote control interface, there are two restrictions:
1. Number of Devices A maximum of 15 devices can be connected in a single
IEEE-488 bus system. For example, one instrument controller, one Calibrator, and
thirteen units under test (UUTs).
2. Cable Length The total length of IEEE-488 cables used in one IEEE-488 system is
2 meters times the number of devices in the system, or 20 meters, whichever is less.
For example, if 8 devices are connected, the maximum cable length is 2 x 8 = 16
meters. If 15 devices are connected, the maximum cable length is 20 meters.
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