Detailed Description; Connection Format; Physical Connection; Transmission Data Packet Formats - Lexicon RT-20 Control Manual

3. Detailed Description

The RS-232 hardware interface specification between the HOST and the RT-20 is described below.

3-1. Connection format

3-1-1. Physical connection

HOST
TxD
RxD
GND
Baud Rate
Data Bits
Parity
Stop bit
Handshaking

3-2. Transmission data packet formats

3-2-1. Transmission data packets from the HOST to the RT-20

There are two kinds of transmission data packets that are described below.
3-2-1-1.

Command Packets

The Command Packets are provided for the Host Controller to request the RT-20 to perform a specific action.
Start character
COMMAND
End character (CR) : 0Dh
S tart
' @ '
3-2-1-2.

Status Request Packets

The Status Request packets are provided for the Host Controller to request the RT-20 to report specific
operating statuses.
Start character
Request status
Request character
End character (CR) : 0Dh
S tart
' @ '
1 9
RT-20
RxD
TxD
GND
(Serial Port settings)
: 9600bps
: 8bit
: None
: 1bit
: None
: '@'
: see "Data Packet COMMAND List"on page 16
C O M M A N D
: '@'
: see "Status Request and Status Response Data Packets" on page 11
: '?'
R equest status
E nd
0D h
E nd
' ? '
0D h
4