HEIDENHAIN PWM 20 - Manual (Page 193)

196 HEIDENHAIN ATS Software User's Manual
6.3 Digital TTL/HTL square-wave output signals
6.3.1 General information
This description contains the differences to sinusoidal signal measurements.
Note on testing
HTL interfaces Basically, all functions that are relevant for encoders with TTL interfaces are also available for
encoders with an HTL interface.
The following limitations must be kept in mind:
 A PWM 20 HTL adapter connector ID 1093210-01 is absolutely necessary!
 No feed-through mode is possible!
 PWT switchover for display of the incremental signals (for mounting exposed encoders with
square-wave interfaces) is not supported.
 Extended tolerance range due to adapter connector
Changes to tolerances: see PWM 20 Operating Instructions
When the encoder is connected automatically via its ID, the operator is prompted by an error
message to connect the adapter connector ID 1093210-01.
The HTL adapter connector ID 1093210-01 is connected to the IN input of PWM 20.
The testing cables are the same as for the TTL interface.
After connecting the adapter, proceed as for TTL measurement.
Different voltage levels are displayed for TTL interfaces (5 V level) and HTL interfaces
(10 ... 30 V levels).