User's Manual

Turbo PMAC PCI HRM
Machine Connections 37
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:$78808. 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:$78808. 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).
Turbo PMAC variables I5060 to 5096 allow an automatic conversion of the analog inputs. The data can be
read from registers Y:$3400 to Y:$341F by setting variables I5061 to I5076 to 8. See the Turbo 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 in the PMAC User Manual.
Outputs can be configured sinking or sourcing by replacing the chips U37 or U53 and configuring the
jumpers E101-102 or E114-E115. The voltage levels can be configured individually by removing resistor
packs RP43 or RP56 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 that connects the PMAC PCI to a DB-25 connector for this
purpose. Standard DB-9-to-DB-25 or DB-25-to-DB-9 adapters may be needed for a particular setup.
Jumper E110 selects between RS-232 or RS422 signals type for the J4 connector. If a cable must be made,
the easiest approach is to use a flat cable prepared with flat-cable type connectors as indicated in the
following diagram: