Chapter 6. Serial I/O, SNP & RTU Protocols240 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222ADMessage (05): Force Single OutputFormat:Address PointNumberData Error CheckFunc05QueryHi HiLo LoNormal Response00HAddress PointNumberData Error CheckFunc0500HHi HiLo LoFigure 56: RTU Force Single Output Message FormatQuery:▪ An Address of 0 indicates a broadcast request. All slave stations process a broadcast re-quest andno response is sent.▪ The function code is equal to 05.▪ The Point Number field is two bytes in length. It may be any value less than the highest output pointnumber available in the attached CPU. It is equal to one less than the number of the output point tobe 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 PointNumber field is to be forced off if the first Data field byte is equal to 0. It is to be forced on if the firstData field byte is equal to 255 (FFH). The second byte of the Data field is always equal to zero.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 inthis request is ensured to be forced to the value specified only at the beginning of one sweepof the user logic.
