Instructions

tion of each of the eight bits of the register by adding the binary-weighted val
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ues 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 corre
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sponding mask bit in the Alarm Status Enable Register is set. It is cleared when the Alarm Sta
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tus 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 correspond
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ing mask bit in the Standard Event Enable Register is set. It is cleared when the Standard Event
Register is read.
Bit 6 Master Summary Bit. Indicates that any other bit in the Status Byte Register is set and its corre-
sponding 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
8.2.11.8 *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 re
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ported. 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 de
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pending on which bits are set. The meaning of the results are as follows:
1st number: sensor status
0: sensors are attached and operating properly
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8 Digital Communications Interface
Commands