1.7 USS - Master- Telegram times
BU 0050 GB-3111 Subject to technical amendments 49
1.7 Master Telegram Times
The telegram times to be monitored depend on the currently valid baud rate and the telegram length.
For the data format: 8E1, the following running times apply:
Minimum total
run time
[msec]
Response delay
time
[msec]
The start pause time and the typical response delay time are determined by the transfer time for two bytes of
data. The maximum response time provided by the telegram is 20msec.
The total run time in the table is the consecutive telegram run time, i.e. the stop bit of the last character
immediately follows the start character of the next character. However, in practice there are time delays
between the bytes of a telegram. Therefore the factor 1.5 is used for the maximum telegram run time.
Maximum total run time = 1-5 * consecutive telegram run time
The interface driver software must check or maintain compliance with the following telegram parameters and
trigger an error if they are repeatedly overshot:
Telegram length details of the received telegram (LGE)
Telegram format (start character / STX, check-sum / BCC)
Character format (parity, start and stop bit)
Total run time of the slave response
Response delay time (typical transfer duration for 2 bytes, max 20 msec)
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