6000 Vortex Series Computer Control • 33
in the Status Byte indicates whether or not data is waiting in the
output buffer. Always check that the MAV bit is set before reading
back information. If the output buffer is empty, the read will fail.
The best way to check the Status Byte is to use a serial poll. A serial poll
returns the same information as the *STB? query, but it bypasses the output
buffer (the Vortex places the *STB? response in the output queue and it can’t
be read until all other responses are read).
The RS-232 interface does not support serial polling, so you would have to
use the *STB? command to query the Status Byte. However, since the Vortex
sends RS-232 responses and errors directly, without using the output buffer,
there is rarely, if ever, a reason to read the output buffer.
Note:
Note:
Note:
Note:
Vortex6000.book Page 33 Tuesday, February 19, 2002 3:25 PM
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