10 - 2 DS7708 2D Vertical Slot Scanner Product Reference Guide
All commands sent between the decoder and host must use the format described in the SSI Message Formats
section. SSI Transactions on page 10-3 describes the required sequence of messages in specific cases.
Table 10-1 lists all the SSI opcodes the decoder supports. It identifies the SSI p
artner allowed to send a
message of each type. The host transmits opcod
es designated type H. The decoder transmits type D opcodes,
and either partner can transmit Host/Decoder (H/D) types.
For details of the SSI protocol, refer to the Simple Serial Inter
face Programmer's Guide (72-40451-xx).
Table 10-1
SSI Commands
Name Type Opcode Description
BEEP H 0xE6 Sound the beeper.
CAPABILITIES_REPLY D 0xD4 Reply to CAPABILITIES_REQUEST; contains a list of the
capabilities
and commands the decoder supports.
CAPABILITIES_REQUEST H 0xD3 Request capabilities report from the decoder.
CMD_ACK H/D 0xD0 Positive acknowledgment of received packet.
CMD_NAK H/D 0xD1 Negative acknowledgment of received packet.
DECODE_DATA D 0xF3 Decode data in SSI packet format.
EVENT D 0xF6 Event indicated by associated event code.
LED_OFF H 0xE8 De-activate LED output.
LED_ON H 0xE7 Activate LED output.
PARAM_DEFAULTS H 0xC8 Set parameter default values.
PARAM_REQUEST H 0xC7 Request values of certain parameters.
PARAM_SEND H/D 0xC6 Send parameter values.
REPLY_ID D 0xA6 Reply to REQUEST_ID; contains decoder's serial number.
REPLY_REVISION D 0xA4 Reply to REQUEST_REVISION contains decoder's
software/har
dware configuration.
REQUEST_ID H 0xA3 Request the decoder's serial number.
REQUEST_REVISION H 0xA3 Request the decoder's configuration.
SCAN_DISABLE H 0xEA Prevent the operator from scanning bar codes.
SCAN_ENABLE H 0xE9 Permit bar code scanning.
START_DECODE H 0xE4 Tell decoder to attempt to decode a bar code.
STOP_DECODE H 0xE5 Tell decoder to abort a decode attempt.
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