Xantrex Technology XHR, XFR, XFR3 Serial Poll In a serial poll, the controller polls each device

Operation

GPIB Operation

Service Service request is a uniline message asserted by the power supply at power on and Request for fault conditions. Ten (10) power supply conditions are defined as faults: CV, CC, OV, OTP, SD, FOLD, ERR, ACF, OPF, and SNSP. See “Accumulated Status, Status, and Fault Registers” on page 50 for more information. Power ON (PON) can also be

flagged in the fault register if the supply's rear panel power on service request (PON SRQ) switch is set to ON. See “Power On Service Request (PON SRQ)” on page 25.

Enabling or disabling a condition from asserting service request does not affect the condition within the power supply, nor the external status indicators.

Serial Poll In a serial poll, the controller polls each device.

Example:

ibrsp Return serial poll byte.

The power supply responds with a 8-bit status byte defined as follows:

Table 3.2 Serial Poll Status Register

Bit		Decimal	Description	Reset By
Position		Weight
0	(LSB)	1	Fault - Set when any bit in the fault	FAULT? query to reset
			register is set by a fault condition in the
			supply. See also “Accumulated
			Status, Status, and Fault Registers”
			on page 50.
1		2	Not used
2		4	Not used
3		8	Not used
4		16	Ready - Set when power supply is	Power supply, during
			ready to accept commands.	command processing
				period
5		32	Error (ERR) - Set when ERR bit	ERR? query
			asserted in status register. See also
			“Accumulated Status, Status, and
			Fault Registers” on page 50.
6		64	Request Service (SRQ) - Set when	Serial Poll
			power supply requests service.
7	(MSB)	128	Power On (PON) - Set when unit	CLR or Device Clear
			initializes at power on.

36 Operating Manual for GPIB for XHR/XFR Series Power Supply