Programming Guide – 39
F?
Always returns 1. This command serves only to maintain the compatibility of the attenuator to
the HP 8157A attenuator.
LRN?
Learn
In HA and HP mode, returns a 58-character string containing a summary of the current settings
of the attenuator. The string is formatted as follows:
• Fiber setting = four characters (always returns 1)
• Output state = four characters (0 = beam block off, 1 = beam block on)
• SRQ mask = eight characters
• Attenuation display offset = 13 characters
• Attenuation = 13 characters
• Wavelength = 16 characters
HA mode example: 1 0 6 10.0000 22.0000 13000e-06
HP mode example: F I;D 1;SRE 6;CAL 10.0000;ATT 22.0000;WVL 13000e-06;
Status Reporting and Service Request Control
The attenuator maintains three eight-bit registers that are used for status reporting and
enabling the GPIB service request interrupt:
• Condition register
• Status register
• SRQ mask register
Condition Register
The condition register monitors the current state of the attenuator mechanism. Bit 2 is set to 1
when the attenuation is constant and to 0 when the attenuator mechanism is moving to a new
setting. The query CNB? returns the value of the condition register. When bit 2 is 1, CNB?
returns 4.
Condition Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
settled
0
0
Status Register
The status register records errors and other events that have occurred in the attenuator. When
an event occurs, the attenuator status logic sets the corresponding bit. The status register can
be read at any time because the bits stay set until the register is read at least once.
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