Manual BG41/BG42/BG43 Interface modules
Rev. 99/49 3-27
3.2.7.4 Functional mode
The SSI module contains two SSI receivers, which can simultaneously read into the data of two
transducers. The data can be read by writing an address into the SSI module’s register area. In
principle, 25 clock pulses are generated, which then read the transducer’s data into the internal shift
register. This shift register can be read in parallel.
The Gray-Code is converted into the binary code within the module. This adjustment can be
determined per channel by the soldered areas of B2 and B4.
The pulse is given to the encoder by means of the RS485 driver software. In principle, 24 bit data is
received. If an encoder with a higher data width is used, as for example 25 bits, the least significant
bit (LSB) is therefore cut off.
The test probes can be supplied with 24 V directly from the printed circuit board. The 24V current
supply for two encoders is safeguarded with 1A.
Fig. 3-28: Block diagram of an SSI
3.2.7.5 Soldered areas
Soldered areas are to be found on the module and are responsible for presetting the data coding for
channels 1 and 2. Please observe the following table for the significance of the individual soldered
areas.
Channel Funktion Bridge B1 Bridge B2 Bridge B3 Bridge B4
1 150 kBit open
300 kBit closed
Binary coding open
Gray coding closed
2 150 kBit open
300 kBit closed
Binary coding open
Gray coding closed
Tab. 3-3: SSI module’s soldered areas
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