7I33 2
HARDWARE CONFIGURATION
GENERAL
Hardwaresetupjumperpositionsassumethat the7I33cardis orientedinanupright
position, that is, with the 50 pin controller connector is on the left hand side,
DEFAULT CONFIGURATION
JUMPER FUNCTION DEFAULT SETTING
W4 CH0 TTL/RS-422 SELECT DOWN = TTL
W3 CH1 TTL/RS-422 SELECT DOWN = TTL
W2 CH2 TTL/RS-422 SELECT DOWN = TTL
W1 CH3 TTL/RS-422 SELECT DOWN = TTL
TTL/RS-422 ENCODER SELECTION
Each 7I33 channel has a selectable TTL or RS-422 (differential) encoder input
conditioning. W1,W2,W3,and W4 determine the encoder input mode. When the jumpers
are in the "DOWN" position, TTL inputs are selected, When the jumpers are in the "UP"
position, RS-422 inputs are selected. W1 selects the input mode for channel 3 , W2 for
channel 2, W3 for channel 1 and W4 for channel 0.
AUX POWER ROUTING
On the 7I33TA an additional jumper allows the AUX POWER connector to supply
power to the whole card or just to the encoder power connections. This jumper is W5.
When W5 is in the ‘UP’ position, encoder power is connected to main 7I33TA 5V. If flat
cable power is sufficient for running the 7I33TA and encoders, this is the suggested
position. If flat cable power is not sufficient for running the encoders, it is suggested that
5V be applied to the AUX power connector and W5 be placed in the "DOWN" position.
IMPORTANT NOTE:
In TTL mode, 7I33 cards previous to revision D have series resistors in the output
pins driving the controller card. FPGA card inputs with 3.3K pull-ups will result in poor
noise immunity of the quadrature signals from the 7I33. If you are using TTL encoder
inputs on a pre-rev D 7I33 card with a FPGA card having 3.3K pull-up resistors, it is best
to remove the pull-up resistor SIP packages connected to the 7I33 from the FPGA card.
This only affects TTL encoder inputs, not differential inputs.
