Functional description and allocation of terminal pins Manual BG41/BG42/BG43
3-24 Rev. 99/49
3.2.7 SSI module (MD39)
3.2.7.1 General
An SSI interface is a synchronous pulsing serial interface. SSI is the abbreviation for Synchronous
Serial Interface. The clock frequency is preset by the user. The SSI module enables the connection
of completely coded transducers with an SSI interface.
The module converts the transducers’ serial information into parallel information and makes these
available to the interface module and consequently the control.
Connections for 2 test probes are available on the module. The connected test probes can be
supplied directly by the module and therefore do not require external voltage supply.
It is possible to transmit the data in Gray or binary code.
Fig. 3-25: Structure of an SSI module
Characteristics of the patented SSI protocol
•= The cabling requirement is not dependant upon the length of the data words.
= Only 4 links are used.
•= Maximum interference immunity by using symmetrical timing and data signals.
•= Safe data acquisition by using the cyclic Gray code (eligible).
•= Electrical decoupling of the receiver and the coder by means of the optical coupling
device.
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