5500A/EP Enhancement Package
Users Manual
14
Remote Commands for Operating the Switch Accessory
The switch accessory has 11 states, all of which can only be activated when the switch
accessory receives a remote command. Remote commands are sent from a PC and
transmitted to the 5500A from the IEEE 4888 or Serial 1 port. The 5500A sends the
command to the switch accessory from its Serial 2 UUT port or directly using a serial
port from the PC.
The communication from the 5500A to the switch accessory is in one direction only, and
no feedback from the switch accessory back to the 5500A is provided. To avoid sending
the wrong command to the switch accessory, make sure the commands for the 5500A
and switch accessory are synchronized when you create the programs.
5500A UUT Setup Parameters
When you use MET/CAL, the parameters for addressing the switch accessory through
the 5500A’s UUT serial port are set automatically so you do not need to program the
5500A. If you address the switch accessory without using MET/CAL, you must program
the correct parameters into the UUT Setup menu in the 5500A.
To enter these parameters, follow this procedure.
1.
From the 5500A’s Setup menu, press the following softkeys to access the REMOTE
Setup menu: INSTMT SETUP
→
REMOTE SETUP.
2.
In the Remote Setup menu, verify the HOST option is set to “gpib” and change if
necessary.
3.
From the Remote Setup menu, press the softkey under UUT SETUP to access the
UUT Setup menu. Enter the parameters shown below into the UUT Setup menu.
w6f.eps
Format for Addressing the Switch Accessory
MET/CAL automatically sets up the proper addressing protocol for each command, but
if you are addressing the switch accessory without using MET/CAL, you must precede
each command with the UUT_SEND command. For example, to program the switch
accessory to provide a 4-Wire short, send the command below, including the quotes:
UUT_SEND “A>“
Programs the switch accessory to provide a 4-Wire Short circuit.
The states and commands are provided in Table 3.
Caution
The internal capacitor should be used for 5500A resistance
outputs only. If the capacitor is used, applying voltages in
excess of 90V dc or peak-to-peak ac will cause the 5500A to go
to standby. The internal 4-Wire Short Circuit mode places a
short circuit across the 5500A NORMAL HI and LO terminals.
Applying voltages in excess of 330 mV will cause the 5500A to
trip into standby.
