---
title: What is the basic sequence of data exchange taking place in BIS M-4008?
description: Data exchange in BIS M-4008
---

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# What is the basic sequence of data exchange taking place in BIS M-4008?

## 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.

 

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