Command Register (Base Address + 13) - Renishaw SP600 Installation And User Manual

SP600 installation and user's guide
www.renishaw.com

Command register (base address + 13)

This write­only register allows the software to control the AC2. Functions are commanded by writing a "1" to the appropriate bit. When a
"0" is written to a bit, nothing happens. This allows the
software to control individual functions by writing to selected bits with a "1", while leaving the other bits set to "0".
The command bits are shown below:
Bits 15 to 12
Not used
Bit 11 - ACQUIRE data and latch timer count
Writing a "1" to this bit causes the AC2 to acquire the SP600 axis deflections and latch the time stamp. The data is presented in registers
"5" to "0", and the time stamp is latched into registers "7" and "6". While the data acquisitions process takes place, its progress can be
monitored by inspecting the BUSY bit in the status register. Writing a "1" to this bit can take place in any of the AC2 operating modes and
will result in data acquisition.
Bit 10 - REQUEST SET PROBE PRESENT
Writing a "1" to this bit causes the AC2 to sample the state of its probe identification circuitry. Upon writing to this bit, the PROBE
PRESENT bit in the status register is set to "1" if an SP600/M/Q probe is present.
Bit 9 - REQUEST RESET OVERTRAVEL
Writing "1" to this bit causes the AC2 to sample the state of its overtravel circuitry. Upon writing to this bit, the OVERTRAVEL bit in the
status register is set to "0" if an overtravel unit is connected and not overtravelled.
Bit 8 - RESET TIMER
Writing a "1" to this bit causes the AC2 to reset the AC2 timer to 0000H and resets the TIMER OVERFLOW flag to "0".
Issued 01 2018
42