+
+#define GEMTAG_CMD_PICC_REQUEST 0x40
+#define GEMTAG_CMD_PICC_CASC_ANTICOLL 0x41
+#define GEMTAG_CMD_PICC_CASC_SELECT 0x42
+#define GEMTAG_PICC_STD_SELECT_CODE 0x93
+#define GEMTAG_PICC_CASC_LEVEL1 0x95
+#define GEMTAG_PICC_CASC_LEVEL2 0x97
+/* from another source (mac gemtag tool) ... */
+#define GEMTAG_PICC_CASC_L1 0x93
+#define GEMTAG_PICC_CASC_L2 0x92
+#define GEMTAG_PICC_CASC_L3 0x94
+#define GEMTAG_PICC_CASC_L4 0x98
+#define GEMTAG_PICC_CASC_L5 0x95
+#define GEMTAG_PICC_CASC_L6 0x97
+
+#define GEMTAG_CMD_PICC_ACTIVATE_IDLE 0x43
+#define GEMTAG_CMD_PICC_ACTIVATE_WAKEUP 0x44
+#define GEMTAG_CMD_SET_DFLT_ATTRIBUTES 0x45
+#define GEMTAG_CMD_SET_ATTRIBUTES 0x46
+#define GEMTAG_CMD_PICC_EXCHANGE_BLOCK 0x48
+#define GEMTAG_PICC_REQIDL 0x26
+#define GEMTAG_PICC_REQALL 0x52
+
+#define GEMTAG_CMD_SWITCH_LED 0x60
+#define GEMTAG_LED_OFF 0x00
+#define GEMTAG_LED_ON 0x01
+
+#define GEMTAG_CMD_GET_FW_VERSION 0x63
+#define GEMTAG_CMD_GET_RIC_VERSION 0x64
+#define GEMTAG_CMD_SET_DEFAULT_BAUDRATE 0x81
+#define GEMTAG_CMD_SET_ONLINE_BAUDRATE 0x82