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5020A
Users Manual
6-46
Example command: *SRE 32
*STB?
This query command returns the Status Byte Register. Reading this register does not
affect it or the output queue. The value returned indicates the condition of each of the
eight bits of the register by adding the binary-weighted values of each bit. The meaning
of each bit, when set (1), is as follows where 0 is the least significant and 7 is the most
significant:
Bit 0 Measurement Status Bit. Indicates that a bit in the Measurement Status
Event Register is set and its corresponding mask bit in the
Measurement Status Enable Register is set. It is cleared when the
Measurement Status Event Register is read.
Bit 1 Alarm Status Bit. Indicates that a bit in the Alarm Status Event Register
is set and its corresponding mask bit in the Alarm Status Enable
Register is set. It is cleared when the Alarm Status Event Register is
read.
Bit 2 Error Bit. Indicates there is an error in the error queue.
Bit 3 Questionable Status Bit. Indicates that a bit in the Questionable Status
Event Register is set and its corresponding mask bit in the Questionable
Status Enable Register is set. It is cleared when the Questionable
Status Even Register is read.
Bit 4 Message Available Bit. Indicates that data is present in the output
queue.
Bit 5 Standard Event Bit. Indicates that a bit in the Standard Event Register is
set and its corresponding mask bit in the Standard Event Enable
Register is set. It is cleared when the Standard Event Register is read.
Bit 6 Master Summery Bit. Indicates that any other bit in the Status Byte
Register is set and its corresponding mask bit in the Service Request
Enable Register is set.
Bit 7 Operation Status Bit. Indicates that a bit in the Operation Status Event
Register is set and its corresponding mask bit in the Operation Status
Enable Register is set. It is cleared when the Operation Status Event
Register is read.
The Status Byte Register can not be set or cleared directly but always reflects the current
state of the reported conditions.
Example: *STB?
Response: 4
*TST? [<bool>]
Reports the results of the self test.
Example: *TST?
Response: 1,1,0,2,0,0,0,0,0,0
This <bool> parameter is optional. If it is not given or if it is 1 a new self-test is
performed and the results returned (the self-test can take several seconds to complete). If
the parameter is 0, the results of the power-on self-test are reported. Ten results are
reported in comma-separated numbers between 0 and 65535. 0 indicates no error or
abnormal condition. Non-zero numbers, when converted to binary values, give specific
information on the type of error depending on which bits are set. The meaning of the
results are as follows:
1st number: sensor status
0: sensors are attached and operating properly
bit 0 is 1: channel 1 sensor is unattached, locked out, or not operating properly