Symbol SE955 Integration Manual page 189

AIM_ON
Description: Turn on aiming pattern
Packet Format
Length
0x04
Field Descriptions
Field Name
Length
Opcode
Message
Source
Status
Data
Checksum
Host Requirements
This command applies only to decoders which support an aim pattern (see
If the TRIGGER_MODE parameter is set to HOST, the host can use this command instead of a AIM pull.
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).
The Aim Duration parameter controls the amount of time the aiming pattern stays on during a trigger pull. The valid values for this
parameter are 0 - 99, which equal 0.1 to 9.9 seconds in 100 msec increments.
Command Sequence
AIM_ON
AIM_OFF
AIM_ON, START_DECODE
AIM_ON, AIM_OFF,
START_DECODE
START_DECODE
Opcode Message Source
0xC5 0x04
Format
Length of message (not
including checksum).
0xC5
4 = Host
Bit 0: Retransmit
Bit 1-7: Unused
2's complement sum of
message contents excluding
checksum.
Table 10-3. Aim Mode
Action performed
Turns on the aiming pattern indefinitely. aim duration = 0
Turns off the aiming pattern.
Turns on the aiming pattern. When
START_DECODE received turns on scan
pattern and begin decoding.
Turns on aiming pattern, turns off aiming
pattern, turns on scan pattern and begin
decoding.
Turns on aiming pattern for aim duration
time, turns on scan pattern and begin
decoding.
Status Data
Size Description
1 Byte Length Field
1 Byte Identifies this Opcode type.
1 Byte Identifies where the message is coming
from.
1 Byte Identifies the transmission status.
Unused bits must be set to 0.
None
2 Bytes Checksum of message.
Table 10-10 on page 10-19).
Table 10-3 lists Aim mode behavior in various situations.
Aim duration parameters
aim duration = 0
aim duration = 0
aim duration = 0
aim duration > 0
Simple Serial Interface 10-5
Checksum