Omega Vehicle Security 1400 manual User Status

API Commands Appendix A

U- User Status

TYPE	System
EXECUTION	Immediate
SYNTAX	Ureq	Request information about various internal conditions of the unit where req
			refers to one of the following request types:
		0	- Query and clear the Event Status Register (ESR)
		1	- Query the Status Byte Register (STB)
		2	- Query and clear Calibration Status Register (CSR)
		3	- Query system settings
		4	- Query current High/Low/Last registers
		5	- Query and clear current High/Low/Last
		6	- Query the Buffer Status String
		7	- Query assigned alarm outputs
		8	- Query configured channels
		9	- Query digital inputs
		10		- Query memory option (in Kbytes)
		11		- Query all channels having programmed valid alarm setpoints
		12		- Query last calibration time/date
		13		- Query last scan read
		14		- Query card IDs
		15		- Query product information
		16		- Query measuring mode parameters
		17		- Query root mean square (RMS)
		18		- Query acquisition states and various system flags

DESCRIPTION

The User Status (U) command is used to return information about various conditions of the unit, and may be sent at any time without interfering with normal operation. Any error conditions, except Calibration Errors, are cleared after the status string is read by the controller. Calibration errors are cleared when the unit is calibrated.

Status strings are returned when the unit is next addressed to Talk. The terminators used and the use of the End Or Identify (EOI) line can be changed with the Set Query Terminator (Q) and Set User Terminator (V) commands. If the unit is configured to trigger on Talk, requesting a status report will not cause the unit to trigger.

The following paragraphs provide more detailed information about the U responses.

U0: Reads and clears the Event Status Register (ESR). Refer to the Status and Event Reporting sections of

Appendix C for details on status reporting. U0 responds with:
001	- Acquisition Complete	016	- Execution Error
002	- Stop Event	032	- Command Error
004	- Query Error	064	- Buffer 75% Full
008	- Device Dependent Error	128	- Power-On

U1: Reads the Status Byte register (STB). The response to this request is the same as in an IEEE 488 Serial Poll except that bit 6 carries the Master Summary Status (MSS) rather than the Request for Service. The Status Byte register is a read-only register whose bits correspond to those of the Service Request Enable (SRE) register with the addition of bit value 64 which responds with the Master Summary Status. The Master Summary Status bit indicates whether or not this device needs service. It responds with:

001	- Alarm	016	- Message Available
002	- Triggered	032	- Event Detected
004	- Ready	128	- Buffer Overrun
008	- Scan Available

U2: Read and clear the Calibration Status Register (CSR). The response to this request is the current contents of the Calibration Status Register. This register contains information regarding the calibration of the unit and any errors encountered while attempting to calibrate the unit. Refer to the following figure for details about the Calibration Status Register.

A-56 ChartScan User’s Manual