Symbol SE 923, Integration Manual

Page: 163 / 238

6-7
Simple Serial Interface
AIM_ON
Description: Turn on aiming pattern
Packet Format
Field Descriptions
Host Requirements
This command applies only to decoders which support an aim pattern (see Table 6-10 on
page 6-27).
Decoder Requirements
The decoder turns on the aim pattern, and responds with a CMD_ACK (if ACK/NAK
handshaking is enabled).
If the aim pattern is not supported, the decoder responds with NAK_DENIED (if ACK/NAK
handshaking is enabled).
Length Opcode Message Source Status Data Checksum
0x04 0xC5 0x04
Field Name Format Size Description
Length Length of message (not
including checksum). 1 Byte Length Field
Opcode 0xC5 1 Byte Identifies this Opcode type.
Message
Source 4 = Host 1 Byte Identifies where the message is
coming from.
Status Bit 0: Retransmit
Bit 1-7: Unused 1 Byte Identifies the transmission status.
Unused bits must be set to 0.
Data None
Checksum 2's complement sum of
message contents
excluding checksum. 2 Bytes Checksum of message.