Delta Tau PMAC2A-PC/104 Manual descargar pdf (Pagina 18)

PMAC2A-PC104 Hardware Manual

ACC-2P Hardware Setup

If this socketed resistor is configured as a pull-down resistor (the default configuration), the combination

of pull-up and pull-down resistors on this line acts as a voltage divider, holding the line at +2.5V in the

absence of an external signal. This configuration is required for single-ended inputs using the ‘+’ lines

alone; it is desirable for unconnected inputs to prevent the pick-up of spurious noise; it is permissible for

differential line-driver inputs.

If this socketed resistor is configured as a pull-up resistor (by reversing the SIP pack in the socket), the

two parallel 2.2 kΩ resistors act as a single 1.1 kΩ pull-up resistor, holding the line at +5V in the absence

of an external signal. This configuration is required if complementary open-collector drivers are used; it

is permissible for differential line-driver inputs.

If Pin 1 of the resistor pack, marked by a dot on the pack, matches Pin 1 of the socket, labeled by a white

square, then the pack is configured as a bank of pull-down resistors. If the pack is reversed in the socket,

it is configured as a bank of pull-up resistors.

RP22 is the 6-pin pull-up/pull-down resistor pack for the handwheel encoder input.

Handwheel Encoder Termination Resistors

The PMAC provides a socket for termination resistors on the handwheel encoder differential input pairs

coming into the board. As shipped, there is no resistor pack in the RP23 socket. If these signals are

brought long distances into the PMAC board and ringing at signal transitions is a problem, a SIP resistor

pack may be mounted on the RP23 socket to reduce or eliminate the ringing. The 6-pin termination

resistor pack is the type that has independent resistors (no common connection) with each resistor using 2

adjacent pins.

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Delta Tau PMAC2A-PC/104 Manual Pagina 18