HP 8712C, User Manual, Page: 334 / 559

Automating Measurements
Controlling Peripherals
1 5
Register
1
15
I
9
I
Table Writeable Ports
Dsscription
Outputs data to the thru lines of the Centronics port. Cent-DO is the
least significant bit, is the most significant bit. Checks Centronics status lines for:
Out of Paper
Printer Not on tine
A C K N O W L E D G E
Sets/clears the user bit according to the least significant bit of A. A least significant bit
equal to 1 sets the user bit high. A least significant bit of 0 clears the user bit.
Sets/clears the limit pass/fail bit according to the least significant bit of A. A least significant
bit equal to 1 sets the pass/fail bit high. A least significant bit of clears the pass/fail bit.
Outputs B-bit data to the Cent-DO thru 07 lines of the Centronics port. is the
least significant bit, is the most significant bit. Sets the Printer-select signal high
Does not check Centronics status lines.
Outputs a byte to the serial port. The byte is output serially according to the configuration
for the serial port.
Table Readable Ports
Number
9 0
Reads the serial port.
Dsscription
1 5 0
Reads the data port Cent-DO thru 07.
1 5
Reads the user bit.
1 5 2
Reads the limit test pass/fail bit.
1 5 1 0 Reads the status port.
DO-Cent-acknowledge
D l - C e n t - b u s y
7-55