Racal Instruments 2251A Operator's Manual page 53

3.16.3 2251A Status Byte
The 2251A status byte is obtained in response to the *STA? command. The byte is
eight bits wide, and the individual bits are interpreted as shown in Table 3.18.
1 (lsb), 2 and 3
2
3
4
5
6
7
8 (msb)
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Table 3.18 - 2251A STA Response Description
BIT
Error number (1 to 5) in binary
1 = External frequency standard
1 = Reading ready
1 = Error condition
1 = Service requested (SRQ)
1 = Gate open
EXPLANATION