FIELD: communication. SUBSTANCE: device provides interface between control and controlled stations. Control station participates in collision, detects collision resolution result and runs formatting. Frame contains controlled address and controlled control signals in order to adjust data byte sequence which reaches first maximum, each period is supplied with acknowledge bit. If acknowledge bit is missed, corresponding data byte is repeated. Message to be transmitted which data byte is greater than said first maximum is sent by splitting into partial messages each of which has data bytes of additional frame with counts which are less than said first maximum and is assigned to corresponding bus frame. Periods of bytes and received acknowledge bits are counted for each frame. If first maximum is reached by said number of data byte period before count of frame data byte is reached by number of acknowledge bit, then flawed frame is detected. In this case any transmission in this frame is ignored and transmission is repeated. EFFECT: transmission of short messages in systems which do not require locking mechanism while continuity of total message is kept without complex data control in receiver. 6 cl, 5 dwg
