PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 6
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 175
▪ The Point Number field is two bytes in length. It may be any value less than the
highest output point number available in the attached CPU. It is equal to one less
than the number of the output point to be forced on or off.
▪ The first byte of the Data field is equal to either 0 or 255 (FFH). The output point
specified in the Point Number field is to be forced off if the first Data field byte is
equal to 0. It is to be forced on if the first Data field byte is equal to 255 (FFH). The
second byte of the Data field is always equal to zero.
6.3.3.5.3 Response:
The normal response to a force single output query is identical to the query.
Note: The force single output request is not an output override command. The output
specified in this request is ensured to be forced to the value specified only at the
beginning of one sweep of the user logic.
6.3.3.6 Message (06): Preset Single Register
6.3.3.6.1 Format:
Figure 28: RTU Preset Single Register Message Format
6.3.3.6.2 Query:
▪ An Address 0 indicates a broadcast request. All slave stations process a broadcast
request and no response is sent.
▪ The function code is equal to 06.
▪ The Register Number field is two bytes in length. It may be any value less than the
highest register available in the attached CPU. It is equal to one less than the number
of the register to be preset.
▪ The Data field is two bytes in length and contains the value that the register specified
by the Register Number Field is to be preset to. The first byte in the Data field
contains the high order byte of the preset value. The second byte in the Data field
contains the low order byte.
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