I should set the jumpers in the "UP" position in my case.  It is because 
the encoder is RS-422 type, is it correct??

Howard
> On Thu, 5 Jun 2008, Howard Chan wrote:
>
> No, you connect the A,/A B,/B and Z,/Z wires from the encoder to the 7I33T. 
> The 7I33T has the 3486 line reciever for the differential signals built in. 
> The 3486 chip on the 7I33T converts these differential signals to single 
> ended 
> TTL level signals for the 5I20. The 7I33T then connects these TTL level 
> signals to the 5I20 with a 50 conductor flat cable.
>
> You must also jumper the 7I33T for differential mode encoders (this is 
> described in the 7I33 manual)
>
> Peter Wallace
>
>
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