User's Manual

PMAC2 PCI Lite Hardware Reference Manual – Preliminary Documentation
Hardware Setup 9
Multiplexer Port
The J2 (JTHW) multiplexer port provides eight TTL-compatible 5V CMOS inputs and eight TTL-
compatible 5V CMOS outputs on a 26-pin IDC header. These can be used directly as general-purpose
digital I/O, or with PMAC2’s special M-variable support (TWB, TWD, TWR, and TWS formats). In
addition, they can be used to support hundreds, or even thousands of multiplexed I/O points on accessory
boards.
Delta Tau provides the following accessory boards that can be connected to the multiplexer port. Each
comes with a flat cable for direct connection to the port.
• Acc-8D Option 7 Resolver-to-Digital Converter Board
• Acc-18 Thumbwheel Board
• Acc-34 family of Digital I/O Boards
• Acc-35A and B Extender Boards
I/O Port
The J3 (JIO) I/O port provides 32 TTL-compatible 5V CMOS I/O points on a 40-pin IDC header.
Direction is selectable by byte. These are used as general-purpose digital I/O points. Acc-21A provides a
convenient connections adapter from this port to OPTO-22 style boards.
Serial Ports
The PMAC2 PCI Lite has two serial-port connectors. Only one of these can be used in an application.
• J5 is a 10-pin IDC header for RS-232 communications. It can be connected to a standard DB9 RS-
232 connector on a host computer or terminal via a flat cable such as the Acc-3L. A commercially
available DB9-to-DB25 adapter can be added to this flat cable if the host computer or terminal has a
DB25 serial connector. Jumpers E17 and E18 on the PMAC2 PCI Lite must connect pins 1 and 2 to
use this port.
• J5A is 26-pin IDC header for RS-422 communications. It can be connected to a standard DB25 RS-
422 connector on a host computer or terminal via a flat cable such as the Acc-3D. Jumpers E17 and
E18 on the PMAC2 PCI Lite must connect pins 2 and 3 to use this port.
A/D-Converter Port
If the Option 12 A/D converters are ordered, the J1 (JANA) analog-input port is provided on the PMAC2
on a 20-pin IDC header. Option 12 provides eight analog inputs at 0 – 5V, or +/-2.5V levels. Option 12A
provides eight additional analog inputs at these levels. The +12V and –12V supplies can either be
brought in on this connector, or brought out on it for the external analog circuitry, if they have been
brought in through TB1 or P1.
Handwheel Port
The J7 (JHW) handwheel port provides two limited supplemental channels, each with a 2-channel
encoder input, and a pulse-and-direction or PWM top-and-bottom pair output. All inputs and outputs are
digital 5V differential line-driver pairs.