Data exchange in BIS M-4008
The communication between the controlling system and processor unit is defined by a sequence protocol. Communication between controlling system and processor unit is implemented using a control bit in the output and input buffer.
Basic sequence:
- The controller sends a command designator to the processor unit in the output buffer with the AV bit set. The AV bit tells the compact processor unit that a job is beginning and the transmitted data is valid.
- The compact processor unit accepts the job and confirms the job by setting the AA bit in the input buffer.
- If additional data needs to be exchanged for the job, readiness for additional data exchange is indicated by inverting the TI and TO toggle bits.
- The compact processor unit has correctly executed the job and sets the AE bit in the input buffer.
- The controller has accepted all data. The AV bit in the output buffer is reset.
- The compact processor unit resets all control bits set in the input buffer during the job (AA bit, AE bit). The processor unit is ready for the next job.
Note:
All specifications are typical values. Deviations are possible depending on the application and combination of R/W head and data carrier.
The specifications apply to static operation; no CRC_16 data checking.