Motorola SE955 Integration Manual page 210

PARAM_SEND
Description: Respond to a PARAM_REQUEST, change particular parameter values
Packet Format
Length Opcode Message Source
0xC6
Field Descriptions
Field Name
Length Length of message (not including
checksum)
Opcode 0xC6
Message Source 0 = Decoder
4 = Host
Status Bit 0: Retransmit
Bits 1, 2: Unused
Bit 3: Change Type
Bits 4-7: Unused
Beep code See
Param_data See
Checksum 2's complement sum of message
contents excluding checksum
This message is sent by the decoder in response to the PARAM_REQUEST message, or by the host to
change the decoder's parameter values.
Status
Format
Table 10-4 on page 10-8
Table 10-8 on page 10-24
Simple Serial Interface 10 - 23
Beep Code Param data
Size Description
1 Byte Length field
1 Byte Identifies this Opcode type
1 Byte Identifies where the message is coming
from
1 Byte Bit 0:
1= Retransmit
Bit 3:
1 = Permanent change
0 = Temporary change - lost when power
removed
Unused bits must be set to 0
1 Byte If no beep is required, set this field to
0xFF
The parameter numbers and data to be
sent to the requester
2 Bytes Checksum of message
Checksum