User programmable protocol: Communication Control Block
Since this was written we have introduced Hash commands. The Open_Serial hash command make this much simpler to do.
User programmable protocol is selected and configured via a suitable Communications Control Block (CCB). The following table summarizes the various parameters in the CCB. Entries are hyper-linked to detailed descriptions. If you are using a User programmable protocol you must set up a CCB with the specified parameters and then invoke it in your program with a ComSetCCB instruction.
| Byte | Function | Example value |
|---|---|---|
| 0 | 3 | 3 |
| 1 | Not used – set to 255 | |
| 2 | CharProfile | 0 (8,1,N) |
| 3 | BaudRate | 5 (9600) |
| 4 | Not used – set to 255 | |
| 5 | Not used – set to 255 | |
| 6 | Not used – set to 255 | |
| 7 | Not used – set to 255 | |
| 8 | Not used – set to 255 | |
| 9 | Not used – set to 255 | |
| 10 | Not used – set to 255 | |
| 11 | Not used – set to 255 | |
| 12 | Not used – set to 255 | |
| 13 | Not used – set to 255 | |
| 14 | Not used – set to 255 | |
| 15 | Not used – set to 255 | |
| 16 | Not used – set to 255 | |
| 17 | Not used – set to 255 | |
| 18 | Not used – set to 255 | |
| 19 | Not used – set to 255 |
Note there are a lot of unused settings! It is safest to set them all to 255 in case we ever invoke any of them in future Firmware revisions.