Hp10746A Error Signal Processing; Hp 10745A Background Information; Program Modifications - HP 5501B Operating And Service Manual

Laser head

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3-17. HP10746A Error Signal Processing

•

If any of the HP10740A backplane error bits are true, the four most significant bits of the

most significant word in a data transfer from the HP10746A to the host computer will be all

ones. These four bits are normally the decimal point bits.

•

Errors are not the only condition that can set these bits to all ones. When the difference

output of an addressed HP10762A is within tolerance, these bits will also be set.

•

After detecting all ones, the host computer must check the next four MSB's to differentiate

between an error condition and the within tolerance condition.

•

If the tolerance condition is true, these next four bits will also be all ones. Otherwise, each of

these bits corresponds to one of the backplane error bits.

•

When a backplane error bit is true, the HP10745A asserts SRQ. The STATUS BYTE of the

HP10745A can be read to determine the source of SRQ. I n the STATUS BYTE, bit 0

corresponds to the REFERENCE ERROR-BIT.

3-20.

To monitor warmup time, the following program modifications can be added to the example

programs contained in Tables 4-12 and 4-13 of the HP5501A Laser Transducer Operating and

Service Manual, HP Part Number 05501-90028. If desired, some form of time-out algorithm can

be added to check if the HP5501B warms up within 10 minutes.

3-21.

Table 3-1 shows the program steps used to modify Table 4-12 in the HP5501A System Manual.

The program uses the HP10760A x-axis card to monitor the laser warmup.

3-22.

Table 3-2 shows the program steps used to modify Table 4-13 in the System Manual. The

program is for a two axis system with the HP10746A in 16-bit mode and using positive-true logic.

The program uses the x-axis card to monitor the laser warmup.

3-23.

Tables 3-3, 3-4, and 3-5 are complete listings of the modified versions of Tables 4-12 and 4-13

found in the HP5501A System Manual.

HP5501B

Operation

3-15

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