Response Data Packets From The Rt-20 To The Host; Ack/Nak Response Packets; Auto Status Feedback Packets - Lexicon RT-20 Control Manual

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

The RT-20 can respond to the HOST in a synchronous and asynchronous mode. The two different response
packets are described below.
3-2-2-1.

ACK/NAK Response Packets

The RT-20 provides an ACK (acknowledge) response to the HOST when the RT-20 has received a correct
command packet, and the HOST command packet has requested no other status data.
Start character
start
'@ '
The RT-20 will send a NAK response packet if the RT-20 has received an incorrect HOST command packet.
Start character
start
'@ '
3-2-2-2.

Auto Status Feedback Packets

The RT-20 will send to the HOST asynchronous status feedback data packets when applicable RT-20 status
changes. The asynchronous status has been divided into levels or groups. The HOST can enable each of the
status feedback groups independently.
Start character
Answer character
End character (CR) : 0Dh
Star t
' @ '
5
: '@', ACK : 06h,
A C K C R
0D h
06h
: '@', NAK
C R
N A K
15h 0D h
: '@'
: see "Status Feedback" on page 14
Status answ er
End character (CR) : 0Dh
: 15h, End character (CR) : 0Dh
End
0D h