Table Of Contents - Lexicon RT-20 Control Manual

1. Introduction ...............................................................................................................................................................................3
1-1. Purpose..............................................................................................................................................................................3
1-2. References.........................................................................................................................................................................3
2. System Description.................................................................................................................................................................3
2-1. Overview ............................................................................................................................................................................3
2-2. Block Diagram ...................................................................................................................................................................3
2-3. RT-20 RS-232 Connector Pin Definition........................................................................................................................3
3. Detailed Description.................................................................................................................................................................4
3-1. Connection format.............................................................................................................................................................4
3-1-1. Physical connection..................................................................................................................................................4
3-2. Transmission data packet formats...................................................................................................................................4
3-2-1. Transmission data packets from the HOST to the RT-20.....................................................................................4
3-2-1-1 Command Packets .........................................................................................................................................4
3-2-1-2. Status Request Packets..................................................................................................................................4
3-2-2. Response data packets from the RT-20 to the HOST.........................................................................................5
3-2-2-1. ACK/NAK Response Packets .......................................................................................................................5
3-2-2-2. Auto Status Feedback Packets......................................................................................................................5
3-3. Data Transaction Sequencing and Timing Requirements...........................................................................................6
3-3-1. Data Packet Transaction Sequencing Requirements...........................................................................................6
3-3-2. Data Transaction Timing Requirements.................................................................................................................6
3-3-3. Specific Requirements for Auto Status Feedback ..................................................................................................6
3-3-4. Example of the transactions.....................................................................................................................................6
3-3-5. Examples of HOST/RT-20 handshaking................................................................................................................7
3-3-5-1. Example of successful handshaking..............................................................................................................7
3-3-5-2. Examples of handshaking errors....................................................................................................................7
3-4. Commands.......................................................................................................................................................................8
3-4-1. HOST Command list................................................................................................................................................8
3-4-2. Specific Commands............................................................................................................................................... 10
3-5. Status Request and Status Response Data Packets.................................................................................................11
3-5-1. HOST Status request and Status Response/feedback list AST Layer: 1 ........................................................11
3-5-2. HOST Status request and Status Response/feedback list AST Layer: 2........................................................11
3-5-3. HOST Status request and Status Response/feedback list AST Layer: 3....................................................... 12
3-5-4. Special Status request and Status Response list AST Layer: None................................................................ 13
3-6. Status Feedback ........................................................................................................................................................... 14
Data Packet
3-7. COMMAND List..................................................................................................................................... 16

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