Agilent Technologies 6031A GP-IB Address Selection, Rqs, Serial Poll Register, Err Rdy Pon Fau

Remote/Local. The remote/local function allows the power supply to operate in either local (front panel) or remote (via GP-IB) control. The user can send Local Lockout to the power supply via GP-IB to disable the front-panel LCL switch only. With Local Lockout, the controller determines if the unit operates in local or remote control; this enables the controller to prevent anyone else from returning the power supply to local control.

Device Clear. Device Clear is implemented in the power supply as Clear (see Page 63). The difference between Clear and Device Clear is that Device Clear can be an unaddressed or addressed command. Device Clear is typically used in systems to send all devices in the system to a known state with a single command (which could be generated by a "panic" button).

Bit Position	7	6
Bit Weight	128	64
Condition	-	RQS

RQS Requesting Service

ERR Remote Programming Error RDY Ready to Process Commands PON Power On Reset

FAU Fault Condition

Table 3-5. Serial Poll Register

5	4	3
32	16	8
ERR	RDY	-

2

4

-

1

2

PON

0

1

FAU

RQS is set when power supply generates a service request, and is reset immediately after a serial poll is conducted.

ERR follows ERR bit in Status Register, which is set whenever power supply detects a remote programming error. ERR is reset by ERR? query.

RDY is set whenever power supply finishes processing a command, and is reset when power supply starts to process a new command. Note that power supply input buffer can accept new commands via GP-IB even while unit is busy processing previously received commands.

PON is set when ac input power is turned on and is reset by CLR command or Device Clear interface message. PON is set in serial poll register regardless of whether PON SRQ is enabled by rear-panel switch.

FAU is set when any bit is set in Fault Register and is reset by FAULT? query.

Device Trigger. Device Trigger is implemented in the power supply as Trigger (see Page 59). Each device that is to respond to Device Trigger must be addressed. Device Trigger is typically used in systems to synchronize the operation of a number of addressed devices.

GP-IB Address Selection

The five GP-IB address switches are located on the rear panel. The GP-IB address is set in binary, with A1 the least significant bit and A5 the most significant bit. Figure 3-8 shows the factory-set address of "5" (binary 00101). The raised portion of the switch is shown in black. Any address from 00 to 30 decimal (00000 to 11110 binary) is a valid GP-IB address. The power supply will operate on whatever valid address is set on the address switches. Address 31 will cause a self-test error.

The operator should be aware that some other instruments on the GP-IB may initialize at a particular address although they can be programmed subsequently to respond to a different address. If the system includes instruments with this characteristic and they are programmed for addresses other than their initialized address, a momentary input power dropout may cause them to re-initialize their address. If another instrument, such as the power supply, is hardware set to that address, the system will not function properly. Therefore, the system program should be written to monitor any re-initialization. Any programmed data, such as addresses, that may have been lost will then have to be reset.

46Operating Instructions