PMAC PCI Lite Hardware Reference Manual
Machine Connections
17
Only one pair of analog-to-digital converter registers is available to the PMAC processor at any given
time. The data appears to the processor at address Y:$FFC8. The data from the selected analog input 0 to
7 (ANAI00-ANAI07) appears in the low 12 bits; the data from the selected analog input 8 to 15
(ANAI08-ANAI15) appears in the high 12 bits (this data is present only if Option 12A has been ordered).
The input is selected and the conversion is started by writing to this same word address Y:$FFC8. A value
of 0 to 7 written into the low 12 bits selects the analog input channel of that number (ANAI00-ANAI07)
to be converted in unipolar mode (0V to +5V). A value of 0 to 7 written into the high 12 bits selects the
analog input channel numbered eight greater (ANAI08-ANAI15) in unipolar mode. If the value written
into either the low 12 bits or the high 12 bits is eight higher (8 to 15), the same input channel is selected,
but the conversion is in bipolar mode (-2.5V to +2.5V).
PMAC variables I60 and I61 allow an automatic conversion of the analog inputs. Setting I60=$FFC8 and
I61 with the number of converted registers desired minus one, the converted data can be found in registers
$0708 to $070F. See the PMAC Software Reference manual for further details.
Compare Equal Outputs Port (JEQU Port)
The compare-equals (EQU) outputs have a dedicated use of providing a signal edge when an encoder
position reaches a pre-loaded value. This is useful for scanning and measurement applications.
Instructions for use of these outputs are presented in the PMAC’s User Manual.
Outputs can be configured sinking or sourcing by replacing the chips U37 and configuring the jumpers
E101-102. The voltage levels can be individually configured by removing resistor pack RP43 and
connecting an external pull-up resistor in each output to the desired voltage level.
Serial Port (JRS422 Port)
For serial communications, use a serial cable to connect the PC’s COM port to the PMAC’s J4 serial port
connector. Delta Tau provides the Acc-3D cable to connect the PMAC PCI to a DB-25 connector.
Standard DB-9-to-DB-25 or DB-25-to-DB-9 adapters may be needed for a particular setup. Jumper E110
selects between RS232 and RS422 signal types for the J4 connector. If a cable needs to be made, use a
flat cable prepared with flat-cable type connectors as indicated in the following diagram:
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