OSEC

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Re: [Muscle] help figuring out reader protocol

From: Chaskiel M Grundman (cg2vandrew.cmu.edu)
Date: Sat Apr 09 2005 - 10:56:59 CDT


--On Saturday, April 09, 2005 05:46:12 PM +0900 Nikolay Elenkov
<nickwd6.so-net.ne.jp> wrote:

This looks like raw T=1 protocol to me.

> 000080 B> 00000000: 04 0000 0490 0102 0097

NAD = 0 (no logical channels)
PCB = 0 (I_BLOCK; seq=0)
LEN = 4
Info = 90 01 02 00
epilogue = 97, the LRC (simple XOR) checksum of all the previous bytes

> 000081 B< 00000000: 04 0000 026e 006c

NAD = 0 (no logical channels)
PCB = 0 (I_BLOCK; seq=0)
LEN = 2
Info = 6e00
epilogue = 6c, the LRC (simple XOR) checksum of all the previous bytes

> 000082 B> 00000000: 04 0040 0490 0102 01d6

NAD = 0 (no logical channels)
PCB = 40 (I_BLOCK; seq=1)
LEN = 4
Info = 90 01 02 01
epilogue = d6, the LRC (simple XOR) checksum of all the previous bytes

> 000083 B< 00000000: 04 0040 026e 002c

NAD = 0 (no logical channels)
PCB = 40 (I_BLOCK; seq=1)
LEN = 2
Info = 6e00
epilogue = 2c, the LRC (simple XOR) checksum of all the previous bytes

etc.

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