| 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_REVISION | D | 0xA4 | Reply to REQUEST_REVISION, contains the decoder's software/hardware configuration. | 
| REQUEST_REVISION | H | 0xA3 | Request the decoder's configuration. | 
| SCAN_DISABLE  | H | 0xEA | Prevent the operator from scanning barcodes. | 
| SCAN_ENABLE  | H | 0xE9 | Permit barcode scanning. | 
| SLEEP | H | 0xEB | Request to place the decoder into low power. | 
| START_DECODE | H | 0xE4 | Tell the decoder to attempt to decode a barcode. | 
| STOP_DECODE | H | 0xE5 | Tell the decoder to abort a decode attempt. | 
| WAKEUP | H | N/A | Wake the decoder from low power mode. | 
