Symbol SE 923, Integration Manual

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6-2
SE-923 Scan Engine Integration Guide
The working environment of the Simple Serial Interface consists of a decoder, a serial cable
which attaches to the host device, and in some instances, a power supply.
The SSI interface transmits all decode data including special formatting (e.g., AIM ID). The
format of the transmitted data can be controlled via parameter settings.
The decoder may also send parameter information, product identification information or
event codes to the host.
All commands sent between the decoder and host must use the format described in the SSI
Message Formats section. The SSI Transactions section describes the required sequence of
messages in specific cases.
Table 6-1 lists all the SSI Opcodes supported by the SE-923. It identifies the SSI partner
allowed to send a message of each type. The host transmits Opcodes designated type
H . The
decoder transmits type D Opcodes, and either partner can transmit Host/Decoder ( H/D )
types.
Table 6-1. SSI Commands
Name Type Opcode Description Page
AIM_OFF H 0xC4 Deactivate aim pattern. 6-5
AIM_ON H 0xC5 Activate aim pattern. 6-7
BEEP H 0xE6 Sound the beeper. 6-9
CMD_ACK H/D 0xD0 Positive acknowledgment of
received packet. 6-11
CMD_NAK
H/D 0xD1 Negative acknowledgment of
received packet. 6-13
DECODE_DATA D 0xF3 Decode data in SSI packet
format. 6-15
EVENT D 0xF6 Event indicated by associated
event code. 6-17
LED_OFF
H 0xE8 De-activate LED output. 6-18
LED_ON H 0xE7 Activate LED output. 6-19
PARAM_DEFAULTS H 0xC8 Set parameter default values. 6-20
PARAM_REQUEST H 0xC7 Request values of certain
parameters. 6-21
Note: D = Decoder, H = Host, H/D = Host/Decoder