Spellman High Voltage Electronics Corporation One Commerce Park,
Valhalla, NY 10595, (914) 686-3600, Fax: (914) 686-2870
FIGURE 3.1
At power –on before any command is sent, the status byte is:
Note that the MSB is logic 1 which identifies this byte as the status register contents at power on, prior to
the issuance of any command. IF the user does not do a serial poll at power on and sends any command,
the status byte obtained in response to a subsequent serial poll will appear as seen in FIGURE 3.2 below.
FIGURE 3.2
After first command the register looks like this:
Note that the MSB of this byte is logic 0 which identifies this byte as the status register contents following
the issuance of at least one command since power on.
When the SQR bit is logic 1, it means this status byte is in response to the first serial poll following the
issuance of an SRQ. If the SQR bit is logic 0, it means that the status byte obtained is one you have
previously examined and/or is not in response to a service request.
When the invalid request bit is logic 1, it means that you have issued a command the unit cannot recognize.
Normally this bit stays at logic 0.
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