MNC-0500-026
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Revision G
Amplifier Communication and Protocol, Rabbit CPU
Example of “Base 95”
Message (“ID/Version” Query): {A0}
1. Take Sum of Message Bytes
‘{‘+’A’+’0’+’}’
123+65+48+125=361
2. Subtract 32
361-32=329
3. Modulus 95
329% 95=44
Table 1-2 Start Byte, End Byte, & Check Byte
Protocol
Packet
Type
Accept/
Reject
Start Byte
End Byte
Check Byte
Ethernet
Terminator
Byte
Printable Message
(ASCII){
(ASCII)}
“Base 95”
13 (CR)
Response Message
Accepted
or
Rejected
{
}
“Base 95”
13 (CR)
Non-
Printable
Message
STX
ETX
Response Message
Accepted
ACK
ETX
“Exclusive OR”
13(CR)
Message
Rejected
NAK
ETX
“Exclusive OR”
13(CR)
Table 1-3 Check Byte Calculation
“Base 95” 1. Take [Sum (all message bytes)]-32=C
2. Then take [Modulus C(“Base95”)]+32=Result
(Printable ASCII character in range 32 to 126)
“Exclusive OR” XOR (all message bytes)=Result (non-
printable byte)
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