Symbol SE 923, Integration Manual

Page: 180 / 238

6-24
SE-923 Scan Engine Integration Guide
PARAM_SEND
Description: Respond to a PARAM_REQUEST, change particular
parameter values
Packet Format
Field Descriptions
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.
Length Opcode Message Source Status Beep Code Param data Checksum
0xC6
Field Name Format Size Description
Length Length of message (not including
checksum). 1 Byte Length Field
Opcode 0xC6 1 Byte Identifies this Opcode type.
Message
Source 0 = Decoder
4 = Host 1 Byte Identifies where the message is
coming from.
Status Bit 0: Retransmit
Bits 1, 2: Unused
Bit 3: Change Type
Bits 4-7: Unused 1 Byte Bit 0: 1 indicates a retransmit
Bit 3: 1 Permanent change
0 Temporary change - lost
when power removed.
Unused bits must be set to 0.
Beep code See Table 6-4 on page 6-10. 1 Byte If no beep is required, set this field
to 0xFF.
Param_data See Table 6-9 on page 6-25. The parameter numbers and data to
be sent to the requester.
Checksum 2's complement sum of message
contents excluding checksum. 2 Bytes Checksum of message.