User Guide

Alesis M20 RS-422 Document ……………………………….........………………………………Page 9
M20 COMMAND RESPONSE DETAIL
M20 Responses
10.01 ACK
- Sent in response to receiving a valid command that does not require data.
12.11 Device Type Return
- Sent as response to Device Type Request command.
- The M20 responds as a Sony BVW-75: 2x 25
where x is TC frame rate: 0=29.97 or 30, 1=25, 2=24
11.12 NAK
- Sent when detecting communication errors or as response to receiving an
undefined command.
- Data Format:
SYSTEM CONTROL
00.0C Local Disable
Action: Put M20 into Remote Only Mode (ONLINE CTRL: Remote)
00.1D Local Enable
Action: Put M20 into Local/Remote Mode (ONLINE CTRL: Local/Rem)
00.11 Device Type Request
Action: None
Response: Device Type = 12.11 Data = 2x yy
x is the TC frame rate: 0=30 frm, 1=25 frm, 2=24 frm
yy is the device id: 25h = BVW-75
TIME OUT
FRAMING
ERROR
OVERRUN
ERROR
PARITY
ERROR
CHECKSUM
ERROR
UNDEFINED
COMMAND
BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0