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Communication / USS
02.2004
6SE7087-6QX70 (Version AD) Siemens AG
8.1-6
Compendium Motion Control
SIMOVERT MASTERDRIVES
The STX start character (= 02 hexadecimal) by itself is not sufficient for
the slaves to clearly identify the start of a telegram because the bit
combination 02/hexadecimal can also occur in the net characters. For
this reason, a no-character start interval of at least 2 character run-
times before the STX is specified for the master. The start interval is
part of the task telegram.
Baud rate in bit/s
Start interval in ms
9600 2,30
ms
19200 1,15
ms
38400 0,58
ms
76800 0,29
ms
93750 0,23
ms
187500 0,12
ms
Table 8.1-1
Minimum start intervals for various baud rates
Only an STX with a preceding start interval identifies the valid start of a
telegram.
Data is always transferred in accordance with the diagram illustrated
below (half-duplex mode):
STX LGE ADR 1.
n BCC
STX LGE ADR 1.
BCC
BCC
STX
Start
pause
Master transmits
Slave transmits
Start
pause
Reply delay
time
Fig. 8.1-6
Transmit sequence
The time interval between the last character of the task telegram (BCC)
and the start of the reply telegram (STX) is known as the
reply delay
time
. The maximum permissible reply delay time is
20 ms, but it must
not be less than the start interval
. If node x does not respond within
the maximum permissible reply delay time, an error message is
deposited in the master.
The master than sends the telegram for the next slave node.
Start interval
Reply delay time
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