I have a pulse encoder which I wish to connect to a PC via an interface =
card. (the card includes other IC's and is still to be made)
=20
The encoder has two digital outputs A+, A-, B+, B-. Two channels A and B =
in quadrature ( 90 degree phase shifted). They are to connect to "Square =
wave differential line driver to EIA RS422".=20
=20
After passing through the RS422 interface circuit the signals will be 5v =
TTL signals ( A and B ) which are then to be connected to a suitable =
up/down counter. The counter has to be at least 24bit (total count =
2500000). Counter frequency around 200kHz. Can be binary or BCD. The =
counter contents have to be read on the fly.
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Can someone help with=20
1. A suitable IC for the RS422 interface?=20

2. A suitable IC for the counter that can be interfaced to the BUS of a =
PC. (either directly or via a buffer IC)

I have checked the Farnell and RS catalogue both of which have many =
RS422 IC's, but no up/own counters.
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I am seeking assistance and advice from the list members.

In both cases information on part numbers and web links would be =
helpful.
=20
Regards,
Edgar.

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