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104S v2 ProLinx Gateway IEC-60870-5-104 (104S) Protocol Implementation
(Firmware v2.xx) Protocol Manual
Page 64 of 157 ProSoft Technology, Inc.
3.4.1 Control Data Transfer
The control communication typically occurs when the client sends a command
request to update the gateway’s command points. The data types addressing are
described in the following table.
Data Type Data Size Addressing Type
C_SC_NA 1 bit Bit
C_DC_NA 2 bits Bit
C_RC_NA 1 byte Byte
C_SE_NA 1 word Word
C_SE_NB 1 word Word
C_SE_NC 2 words Word
Some of the command points may be configured to be selected before executed.
Refer to the following parameter to configure the select/operate timeout period.
After the gateway receives the SELECT operation it will wait for this period of
time for the EXECUTE operation. If the gateway does not receive an EXECUTE
operation within this period of time it will require another SELECT operation
before the EXECUTE operation.
March 19, 2010
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