| Position | meaning | possible values |
|---|---|---|
| 0 | allways 0x32 | |
| 1 | type | 1,2,3 or 7 |
| 2,3 | unknown | 0 |
| 4,5 | sequence number | |
| 6,7 | length of parameters | |
| 8,9 | length of data | |
| 10,11 | error code |
| Position | meaning | possible values |
|---|---|---|
| 0 | a function number | |
| rest | depends on function number |
| Position | meaning | possible values |
|---|---|---|
| rest | depends on function number |
| Position | meaning | possible values |
|---|---|---|
| 0 | function number for read | 4 |
| 1 | number of items to read | 1..20 |
| 2.. | item adresses, 12 byte each |
| Position | meaning | possible values |
|---|---|---|
| 0,1,2 | unknown | allways 0x12, 0x0a, 0x10 |
| 3 | transport size or unit size | 1=single bit, 2=byte, 4=word |
| 4,5 | length in byte | |
| 6,7 | number of data block | 0 for ares other than data block |
| 8 | area code | see area |
| 9,10,11 | Start address in bits. | multiples of 8, if unit size is not bits |
| Position | meaning | possible values |
|---|---|---|
| 0 | function number for read | 4 |
| 1 | number read items | 1..20 |
| 2.. | items, 4 byte "data header" +data each |
| Position | meaning | possible values |
|---|---|---|
| 0 | return code | 0xFF means ok, data follows after this header. Other codes give reasons why no data is returned. |
| 1 | transport size or unit size | 4=single bit, 9=byte |
| 2,3 | length in bits |