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Power On Service Request (PON SRQ)
The Power ON Service Request (SRQ) switch is located on the GPIB subplate rear
panel S1 switch. Enabling the SRQ switch causes the power supply to send a service
request to the computer controller when the power supply is turned on or when it
re-initializes after a momentary power interrupt. When the PON SRQ state is tripped,
the front panel SRQ LED will also turn on. You can clear the service request and turn
off the SRQ LED by performing a serial poll. See "Command Reference" on page
39 for information about the SRQ command. Table 2.3 shows the condition of the
SRQ switch in relation to the position reference markings on the rear panel subplate.
The location of the switch and reference markings can be found in Figure 2.2, "GPIB
Interface Subplate" on page 17.
Table 2.3 SRQ Switch Selection
Rear Panel SRQ Switch Position PON SRQ State
0
1
Remote/Local Operation
Remote/Local
Start the power supply either in local mode or in remote mode by setting the power
ON remote (PON REM) switch which is located on the unit's rear panel. See
Mode Startup
Table 2.4 for the switch settings
Table 2.4 Remote/Local Start-up Settings.
Switch Position
0
1
With the rear panel PON REM switch set to 0, the power supply will start up in
remote mode. The green REM LED on the front panel will turn on, signaling that the
power supply is under the control of the digital interface card. The output of the
power supply is active on startup. See Table 2.5 for more information. To promote
load safety, power ON defaults are zero for the output voltage and current limit, and
110% of maximum output voltage for the OVP trip point. See Section 3, "Operation"
for more information about the interface commands listed in the table.
Installation and Configuration
Power On Service Request (PON SRQ)
PON SRQ Enabled
PON SRQ Disabled
Power ON results
Unit in remote mode
Unit in local mode
21
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