User's Manual

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Description of the Subpartyline Manual B-Net® 91 04
44 © Kaba GmbH 12/2008
8.5 Data from Subterminal to Control Unit
Transmit polling
Control unit Subterminal
The subterminal does not respond if the address is different from its own address,
or if an error has been detected, or if the two address characters are different. The
control unit repeats the transmit poll after an internal time-out.
<EOT> GID GID DID DID <ENQ>
no response
In the case of the same address, the subterminal must respond. If it has no data for
the control unit, an EOT is sent. This completes the entire transmission process.
<EOT> GID GID DID DID <ENQ>
<EOT>
If data exists, these data is sent and the control unit’s acknowledgement is waited
for. If an RVI is received, the data is acknowledged which is confirmed by the
subterminal by an EOT. This completes the transmission.
<EOT> GID GID DID DID <ENQ>
<STX> Text <ETX> <LRC>
<RVI>
<EOT>
If the control unit answers with NAK, the subterminal will repeat the data
transmission. The control unit repeats the NAK up to two times and then terminates
the transmission by EOT. This does not yet acknowledge the data record and
therefore it must not be discarded by the subterminal. The subterminal has to wait
for the next transmit poll to send the data record.
<EOT> GID GID DID DID <ENQ>
<STX> Text <ETX> <LRC>
<NAK>
<STX> Text <ETX> <LRC>
<NAK>
<STX> Text <ETX> <LRC>
<NAK>
<STX> Text <ETX> <LRC>
<EOT>