Delta Tau PMAC2A-PC/104 Manuál stáhnout pdf (Strana 17)

PMAC2A-PC104 Hardware Manual

ACC-2P Hardware Setup 11

ACC-2P HARDWARE SETUP

On the ACC-2P, you will see many jumpers (pairs of metal prongs), called E-points. Some have been

shorted together; others have been left open. These jumpers customize the hardware features of the ACC-

2P for a given application and must be setup appropriately. The following is an overview of the several

jumpers grouped in appropriate categories. For a complete description of the jumper setup configuration

please refer to the ACC-2P E-Point Descriptions chapter.

I/O Configuration Jumpers

E3-E4: JHW, PD Function Select – When jumper E3 connects pins 2 and 3, a set of pulse and direction

signals can be output on channel 1 (pins 2 to 5) of the JHW, PD port. If E3 connects pins 1 and 2, then

channel 1 is configured as a handwheel encoder input. When jumper E4 connects pins 2 and 3, a set of

pulse and direction signals can be output on channel 2 (pins 6 to 9) of the JHW, PD port. If E4 connects

pins 1 and 2, then channel 2 is configured as a handwheel encoder input.

E5: I/O Gate address select – If jumper E5 connects pins 1 and 2 the I/O features on the ACC-2P will be

accessed at the regular addresses and the JTHW port can be used as a multiplexer port. When E5

connects pins 2 and 3 the I/O features on the ACC-2P board will be accessed at the regular addresses plus

$40, and this is necessary only when both ACC-2P and ACC-1P are used with the same PMAC2A-

PC/104 baseboard.

E7-E10: Ports Direction Control – These jumpers select the I/O lines direction of the JTHW and the

JOPT connectors. This allows configuring these ports as all inputs, all outputs or half inputs and half

outputs according to the following tables:

JTHW Connector

JOPT Connector

E7 E8

DATx

lines

SELx

lines

E9 E10

MOx

lines

MIx

Lines

OFF OFF Output Output OFF OFF Output Output

OFF ON Output Input OFF ON Output Input

ON OFF Input Output ON OFF Input Output

ON ON Input Input ON ON Input Input

If E7 is removed or E8 is installed then the multiplexing feature if the JTHW port cannot be used.

Communication Jumpers

E6: Communications Port Selection – When jumper E6 connects pins 1 and 2 the PC/104

communications port is enabled. If E6 connects pins 2 and 3 the Ethernet or USB ports are enabled. Only

one port can be used at a time. If either the Ethernet or USB ports are used then jumper E19 on the base

board must be installed and jumper E18 on the base board must be removed. In order to communicate

through the RS-232 serial port jumper E6 must be installed, either in position 1-2 or 2-3.

Resistor Packs Configuration

Differential or Single-Ended Handwheel Encoder Selection

The handwheel encoder differential input signal pairs to the PMAC have user-configurable pull-up/pull-

down resistor networks to permit the acceptance of either single-ended or differential signals in one

setting, or the detection of lost differential signals in another setting.

The ‘+’ inputs of each differential pair each have a hard-wired 1 kΩ pull-up resistor to +5V. This cannot

be changed.

The ‘-‘ inputs of each differential pair each have a hard-wired 2.2 kΩ resistor to +5V; each also has

another 2.2 kΩ resistor as part of a socketed resistor pack that can be configured as a pull-up resistor to

+5V, or a pull-down resistor to GND.

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