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08.89
Transmission rate
The data transmission rate is specified in bits/sec. (bauds). At the configuration stage, the
following values can be selected from the table below.
19200
bauds
9600
"
4800
"
2400
"
1200
"
600
"
300
"
150
"
110
"
Priority
The priority of the 3964R procedure in case of an initialization conflict is configured. For the
other node, the opposite priority must be set accordingly.
The following can be selected
•
high priority
•
low priority
Monitoring times
The following monitoring times are used for monitoring the data transfer:
•
Acknowledgement monitoring time (= timeout)
The acknowledgement monitoring time is started after transmission of the STX or DLE
ETX BCC control characters.
If no valid positive acknowledgement arrives within the timeout period, the driver is
requested to repeat the same job. If even after several repeated attempts (configurable) a
correct transmission was not possible, an error is entered in the exception trace.
The timeout period is programmable to integrate several components. The
acknowledgement monitoring period can be specified in intervals of 10 ms (1 word, max.
FF FF).
•
Character monitoring time (character delay time)
The receiving CP 315 monitors the arrival of the individual characters within the character
delay time.
If a character does not arrive within the character delay time, the receiving driver aborts
reception, sends NAK and returns to the passive state.
Since, in general, different types of units will communicate with each other, the character
delay period can be parameterized. It can be specified in intervals of 10 ms (1 word,
max. FF FF).
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
9.1 Reception using the 3964R procedure
6FC5 197-0AB20-0BP0
9 Appendix
9–5
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