MTS FlexTest Models 200 - Manual (Page 196)

MTS FlexTest® Models 40/60/100/200 Controller Hardware
Model 494.49 Quad Encoder Interface Card
Mezzanine Cards 196
Specifications–Model 494.49 Quad Encoder Interface Card
SSI duty-cycle settings
Older versions of the Model 494.47 and Model 494.49 cards used a fixed
25% low/75% high duty cycle for the SSI clock. To support other types of
SSI encoders, newer versions of these cards will set the duty cycle based on
the SSI baud rate setting. With the new design:
• SSI baud rates less than or equal to 115.74 kHz = 50/50 duty cycle.
• SSI baud rates greater than 115.74 kHz = 25/75 duty cycle.
Model 494.49 cards that have the programmable-logic-device revision listed
below will support the 50/50 duty cycle.
P ARAMETER S PECIFICATION
Digital
Transducer/
Encoder
Electrical
Interface TTL transceivers.
The Model 493.80 Quad Encoder transition board converts four
channels of differential RS-422 encoder signals (J3-J8) into TTL
encoder signals (J11, J12) that are compatible with the Model
494.49 Quad Encoder Interface card.
Supported
Digital
Transducer/
Encoder
Interfaces Use hardware-mapping software to select the type of interface:
SSI (Temposonics R)
Gurley (Teledyne)
Incremental/Velocity (includes counter selection)
PWM (Temposonics G)
Note The interface type that you select applies to each of the
four channels on the Model 494.49 card.
Device
Power The Model 494.49 card does not supply power to external
devices. Device power is supplied by the Model 493.80 Quad
Encoder transition board or by an external power supply.
E NCODER C ARD P ROGRAMMABLE L OGIC D EVICE R EVISION
Model 494.49 C or higher