APPENDIX
Appendix 9.12 When changing the communication protocol and transmission setting
This section provides a program example that changes the communication protocol and transmission setting using the REMFR/REMTO instructions and I/O signals. (When the module is used on a MELSECNET/H remote I/O station, the station No. cannot be changed because the UINI instruction is unavailable.)
For changing the communication protocol and transmission setting, refer to Chapter 15 of the User's Manual (Application).
(1) Program conditions
When the change command (X1031) turns on, the communication protocol and transmission setting are changed.
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| • Change command .................................................................. |
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| X1031 | |||
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| • Changing flag | .......................................................................... |
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| M300 | ||
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| • Change completion flag.......................................................... |
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| M301 | |||
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| • CH1 change command pulse signal ...................................... | M10 | ||||||
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| • CH1 change command........................................................... |
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| M11 | |||
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| • CH1 mode switching completion............................................ | M12 | ||||||
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| • CH1 receive processing.......................................................... |
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| M13 | |||
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| • CH1 send processing ............................................................. |
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| M14 | |||
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| • CH2 change command pulse signal ...................................... | M20 | ||||||
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| • CH2 change command........................................................... |
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| M21 | |||
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| • CH2 mode switching completion............................................ | M22 | ||||||
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| • CH2 receive processing.......................................................... |
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| M23 | |||
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| • CH2 send processing ............................................................. |
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| M24 | |||
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| • REMFR/REMTO instruction completion device..................... | M100 to 107 | ||||||
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| • REMFR/REMTO instruction abnormal completion flag......... | M200 to 205 | ||||||
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| • Switching mode No. designation............................................ | D0, D10 | ||||||
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| • | Transmission specifications after switching designation....... | D1, D11 | |||||
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| • | Switch setting error and mode switching error status............ | D2, D12 | |||||
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| (b) Buffer memory settings used in this example |
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Address, Decimal |
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(Hexadecimal) |
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| Description |
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CH1 | CH2 | Position |
| Specified |
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114 (90H) | 304 (130H) |
| — | Switching mode No. designation |
| MC protocol | 0001H | ||
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| b0 |
| OFF |
| Operation |
| Independent |
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| setting |
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| b1 |
| OFF |
| Data bit |
| 7 bits |
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| b2 |
| OFF |
| Parity bit |
| No |
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| b3 |
| OFF |
| Even/odd parity |
| Odd |
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| b4 |
| ON |
| Stop bit |
| 2 bits |
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| b5 |
| ON |
| Sum check |
| Yes |
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| Transmission | code |
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| Write during |
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145 (91 H) | 305 (131H) | b6 |
| OFF | specifications |
| Prohibited | 85B0H | |
| RUN |
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| after switching |
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| b7 |
| ON | designation | Setting |
| Allowed |
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| modifications |
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| b8 to b11 |
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| Communication |
| 9600bps |
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| rate setting |
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| B12 to 14 |
| All OFF |
| For system |
| — |
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| Transmission |
| Make setting |
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| B15 |
| ON |
| specifications |
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| as set in this |
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| after switching |
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515 | (203H) |
| — | Switch setting error and mode switching error status | — | ||||
App. - 54 | App. - 54 |