Renishaw SP25M Installationsanleitung Seite 22

SP25M installation and integration guide
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Probe power supply protection with failure monitoring
The probe's power supplies are protected from overcurrent by self-resetting fuses (polysilicon current limiting devices) in each supply line.
When an overcurrent occurs, the AC3 automatically removes all power from the probe and sets the appropriate OVERCURRENT bit. Software
can inspect the status of these bits by reading the AC3 status register ﴾bits '0', '1' and '2'. of register '14'﴿.
AC3 board identification byte
Software is able to read this byte at any time when the page register ﴾'base + 8'﴿ is set to 00H, to confirm that the adaptor board fitted at the
expected base address is indeed AC3. Upon power up, the page register is set to 00H allowing software to read this identification byte without
writing to the board. The AC3 identification byte varies, depending upon the selected bus width of the AC3. When it is in 8-bit mode, the ident
is 0AH. In 16‐bit mode, the ident is 09H. Most Renishaw ISA bus adaptor cards have a unique board identification byte at the address 'base +
15'.
AC3 board functionality version number byte
The AC3 (like Renishaw's AC2 card) has software readable, version numbering. Often, changes to the hardware are invisible to the customer,
such as when a component that is no longer available causes the design to be changed, so changes to the hardware that cause a
consequential change to the customer's software cause the FUNCTIONALITY VERSION* (see note below) number to be incremented.
When the page register has been written to with 02H, the FUNCTIONALITY VERSION* number can be read from 'base + 15'. The functionality
version is incremented by Renishaw when a change has been made to the design that requires a change to the customer' software.
* NOTE: 'Functionality version' was previously referred to as 'software version' in the SP600/M/Q SCR600 AC1/2 Installation and
integration guide (part number H-1000-5175).
Issued 12 2021
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