78 Ethernet module User’s Manual
Chapter 5 Computer Link Protocol and the PC Link Protocol Transmission
5
• DRegNo(Remote station register number)
The remote station specifies the start register to which the transmission data is written.
• TimeCnt(Timeout value)
It is specified in 0.1-second unit to monitor the response time form the remote station.
(3) Considerations
• The read operation is not synchronized with the remote station controller scan
operation. If synchronization is necessary, applications must perform synchroni-
zation, such as transferring the data to separate registers at the start of the con-
troller scan.
• When PC link transmission is used, if an application repeatedly transmits to a
nonexistent remote station at short intervals (less than 100 ms), an insufficient
resources error may occur. Applications should either stop transmitting to the non-
existent remote station or increase the interval between transmissions to prevent
this error.
F E0
CMD+4
0: User specified value is used (0.1 - 3276.7 seconds)
1: Default value (30 seconds)
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