Configuration
5-55
7SA6 Manual
C53000-G1176-C156-2
occurs during communication with the device. In order to modify these values, enter
an integer value for RQ 1, between 200 and 9999, and for RQ 2, from 0 to 9999.
Service and Opera-
tor Interface
Settings for the interfaces at the device can performed in these tabs. The link address-
es and maximum message gap appear in the Service Interface and Operator
Interface tab besides the settings for data format and transfer speed (example Fig-
ure 5-52).
Figure 5-52 DIGSI
®
4, Settings for the service interface — example
For the IEC communication, each SIPROTEC
®
device must have a unique IEC ad-
dress assigned to it. Only the addresses which are within the current address range
and have not yet been occupied are displayed.
The setting for the maximum message gap is only applicable when the device is to
communicate using a modem via one of the interfaces. A gap is the maximum allow-
able time duration of interrupted transmission within one telegram transmission.
Transfer gaps are created when using modems as a result of data compression, error
correction, and baud-rate differences. For good data transmission between modems,
a setting of 1.0 sec is recommended. For poor connections, this value should be in-
creased.
Large values slow down communications in case of errors. When using a direct PC
connection, Max. message gaps may be set to 0.0 sec.
Note:
Do not use operator interface for modem communication!.
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