User's Manual

PMAC2A PC104 Hardware Reference Manual
Introduction 3
for PC/104-bus communications, PMAC2A PC/104 Option-2A must be ordered. The key component
installed with this option is U17. USB/Ethernet and PC/104 bus communications cannot be made
simultaneously it is jumper selectable.
Acc-2P Option 3: I/O Ports
Option 3 provides the following ports on the Acc-2P communications board for digital I/O connections.
• Multiplexer Port: this connector provides eight input lines and eight output lines at TTL levels.
When using the PMAC Acc-34x type boards these lines allow multiplexing large numbers of
inputs and outputs on the port. Up to 32 of the multiplexed I/O boards may be daisy-chained on
the port, in any combination.
• I/O Port: this port provides 16 general-purpose digital I/O lines at TTL levels and these can be
configured as all inputs, all outputs or eight inputs and eight outputs.
• Handwheel port: this port provides two extra channels, each jumper selectable between encoder
input or pulse output.
Acc-8TS Connections Board
Acc-8TS is a stack interface board to for the connection of either one or two Acc-28B A/D converter
boards. When a digital amplifier with current feedback is used, the analog inputs provided by the Acc-
28B cannot be used.
Acc-8ES Four-Channel Dual-DAC Analog Stack Board
Acc-8ES provides four channels of 18-bit dual-DAC with four DB-9 connectors. This accessory is
stacked to the PMAC2A PC/104 board and it is mostly used with amplifiers that require two ±10 V
command signals for sinusoidal commutation.
Acc-8FS Four-Channel Direct PWM Stack Breakout Board
Acc-8FS it is a 4-channel direct PWM stack breakout board for PMAC2A PC/104. This is used for
controlling digital amplifiers that require direct PWM control signals. When a digital amplifier with
current feedback is used, the analog inputs provided by the Option 12 of the PMAC2A PC/104 (the
Option 2 of the Acc-1P or the Acc-28B) could not be used.