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SP600 installation and user's guide
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AC2 software interface
Board identification (base address + 15)
This read-only register returns the value 0CH if the board is in 8-bit mode or 0BH if the board is in 16-bit mode.
Status register (base register + 14)
This read-only register returns the status of the AC2 card. Status bits are as follows:
Bit 7
Not used.
Bit 6 - BUSY
This bit is set to "1" when the AC2 has been commanded to acquire data. It is reset to "0" when the data conversion is complete. This
takes approximately 15 μs.
NOTE: The host PC should not attempt to read the probe deflections or the timer value while the BUSY bit is set to 1. Any data read
during this period will be invalid.
Bit 5 - TIMER OVERFLOW
This bit is set to "1" when the timer has overflowed. It is reset to "0" when the timer has been reset.
Bit 4 - PROBE PRESENT
This bit is set to "1" if an SP600 / M / Q probe has been connected to the AC2 and the REQUEST SET PROBE PRESENT bit has been
written to with a "1" (see 'Detection of a connected SP600 / M / Q
automatically resets to "0".
Bit 3 - OVERTRAVEL ERROR
This bit is set to "1" if the overtravel unit is overtravelled or not connected. It is set to zero if the overtravel unit is connected, not
overtravelled, and the REQUEST RESET OVERTRAVEL bit has been written to with a "1" (see 'Interface for the SP600 overtravel
Bit 2, 1, 0 - OVERCURRENT STATUS FLAGS
These show the status of the three probe output overcurrent protection devices on the AC2. They are set to "1" when one of the probe
supplies has had an overcurrent.
Issued 01 2018
section'). If the probe is disconnected from the AC2, then the bit
unit').
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