SIEMENS AS511的通信协议B_INFO

　　　　　　input: - block number
output: - initial address of DW0 in AG


PG AS
(hex) (hex)
---------------------- function start --------
02 ----> STX
<---- 10 DLE
<---- 06 ACK
1A ----> B_INFO function code = 1Ah
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 16 AG answer=16h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- header info --------
01 ----> ID=01h for Datablock
XX ----> DB number (0..255)
10 ----> DLE
04 ----> EOT
<---- 10 DLE
<---- 06 ACK
---------------------- data  --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 00 NUL
<---- XX DB initial address
<---- XX
<---- 70 synchronization code: 70 70
<---- 70
<---- 41 block ID and DB number : 41 XX
<---- XX
<---- XX PG ID code: XX XX
<---- XX
<---- XX library number: XX XX
<---- XX
<---- XX block length (words): XX XX
<---- XX
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
---------------------- terminate  --------
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 12 AG "end of transmission" code: 12h
<---- 10 DLE
<---- 03 ETX
10 ----> DLE
06 ----> ACK
//////////////////////////////////////////////////////////////////////////////
DB_READ
input: - initial address in AG
               - final address in AG
output: - contents of datawords



   PG AS
(hex) (hex)
---------------------- function start --------
02 ----> STX
<---- 10 DLE
<---- 06 ACK
04 ----> DB_READ function code = 04h
<---- 02 STX
10 ----> DLE
06 ----> ACK
<---- 16 AG answer=16h
<---- 10 DLE
<