Host interfaces Logical $SCRDR Protocol $SCRDR Messages
15/09/2021$SCRDR Messages
Everytime the Smart Reader reads a tag (contactless card, NFC tag or RFID label, data coming from a BLE token...), it sends to the listening host(s) an $SCRDR message, formatted as follow:
$SCRDR;<Interface>;<Protocol>;<Template>;<RSSI>;<TagId>;<Move>;<TagData>;<TagDetails>*<Checksum><CR><LF>
Fields in the $SCRDR message
| Field | Format | Description |
|---|---|---|
| Message identifier | "SCRDR" |
Constant to identify the message. |
| Interface | Hex, 2 digits (1 byte) | Which interface has read the token? See Interfaces for details. |
| Protocol | Hex, 2 digits (1 byte) | Protocol used to read the token. See Protocols for details. |
| Template | Hex, 2 digits (1 byte) | Template used to read the token. |
| RSSI | Hex, 2 digits (1 byte) | RSSI of the token, if this data is available (BLE and RFID UHF). |
| TagId | Hex, variable length | Identifier of the token (output of the Smart Reader template). See TagId for details. |
| Move | empty, "I", "R" or "IR" |
Tells whether the token is Inserted ("I"), Removed ("R") or has just made a short apparition (inserted+removed, hence "IR"). The field is empty if the Smart Reader is not configured to track the movements of the tokens. |
| TagData | Hex or text, variable length | Some token-specific data than the Smart Reader template may provide in some situation (for instance the status of a tamper for some NFC tags, the advertising data in BLE spy mode, ...). See TagData for details. |
| TagDetails | Hex or text, variable length | Some advanced token-specific data than the Smart Reader template may provide in some situation (for instance scan response data in BLE spy mode, ...). See TagDetails for details. |