I was checking the communication between RsLogix 500 and SLC 500 (DF1 full duplex) and found that RSLogix issues some undocumented commands and some very strange reads. Can someone please explain it?
Thank you in advance.
1. Undocumented Command (0x0F, Function 0xA3?):
DLE STX 01 00 0F 00 70 6C A3 56 02 84 01 00 FF D4 53 FF D6 53 FF 60 54 FF 62 54 FF 92 54 FF 94 54 FF D2 53 56 02 84 05 00 DLE ETX 2E D3
Reply:
DLE STX 00 01 4F 00 70 6C 00 26 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 01 00 00 10 00 00 00 00 DLE ETX 6A 75
2. Strange Read (What is the logical address 00 00 00 00?):
DLE STX 01 00 0F 00 70 48 A2 2C 00 00 00 00 DLE ETX 96 A6
Reply:
DLE STX 00 01 4F 00 70 48 55 4E 54 49 54 4C 45 44 00 00 00 00 00 00 00 00 00 00 3D 00 12 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B3 77 DLE ETX F3 6A
3. Strange Read (What is the logical address 00 00 0B 00?):
DLE STX 01 00 0F 00 70 4C A2 14 00 00 0B 00 DLE ETX E2 2F
Reply:
DLE STX 00 01 4F 00 70 4C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DLE ETX 05 48
4. Strange Read (What is the logical address 00 64 00 00?):
DLE STX 01 00 0F 00 70 50 A2 18 00 64 00 00 DLE ETX 8D 48
Reply:
DLE STX 00 01 4F 00 70 50 4C 04 01 00 04 00 02 80 00 00 45 43 00 00 02 00 00 00 00 00 E0 01 30 00 DLE ETX 70 6E
Any help would be greatly appreciated,
bga
Thank you in advance.
1. Undocumented Command (0x0F, Function 0xA3?):
DLE STX 01 00 0F 00 70 6C A3 56 02 84 01 00 FF D4 53 FF D6 53 FF 60 54 FF 62 54 FF 92 54 FF 94 54 FF D2 53 56 02 84 05 00 DLE ETX 2E D3
Reply:
DLE STX 00 01 4F 00 70 6C 00 26 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 01 00 00 10 00 00 00 00 DLE ETX 6A 75
2. Strange Read (What is the logical address 00 00 00 00?):
DLE STX 01 00 0F 00 70 48 A2 2C 00 00 00 00 DLE ETX 96 A6
Reply:
DLE STX 00 01 4F 00 70 48 55 4E 54 49 54 4C 45 44 00 00 00 00 00 00 00 00 00 00 3D 00 12 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B3 77 DLE ETX F3 6A
3. Strange Read (What is the logical address 00 00 0B 00?):
DLE STX 01 00 0F 00 70 4C A2 14 00 00 0B 00 DLE ETX E2 2F
Reply:
DLE STX 00 01 4F 00 70 4C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 DLE ETX 05 48
4. Strange Read (What is the logical address 00 64 00 00?):
DLE STX 01 00 0F 00 70 50 A2 18 00 64 00 00 DLE ETX 8D 48
Reply:
DLE STX 00 01 4F 00 70 50 4C 04 01 00 04 00 02 80 00 00 45 43 00 00 02 00 00 00 00 00 E0 01 30 00 DLE ETX 70 6E
Any help would be greatly appreciated,
bga