| Reader Communication Protocol Developer's Guide |
|
Set Frequency Hopping
The Set Frequency Hopping command sets the frequency hopping table of reader and, optionally, the regulatory hoping time, to use when hopping. Each frequency is encoded as a 32-bit value in kHz. The maximum number of frequencies which can be set is 50. The settable frequencies of a certain work region can refer to Region Frequencies Table described in Set Current Region section. This command has two formats for setting the frequency hopping table and regulatory hopping time.
Command Attribute
| Command Code | Bootloader Command | App Firmware Command |
|---|---|---|
| 0x95 | No | Yes |
Host to Reader
Set Frequency Hopping Table
Format of Data Field
| Field | Byte Length | Description |
|---|---|---|
| frequencies | M*4 bytes | M frequencies, each frequency is 4 bytes length. |
Set Regulatory Hopping Time
This format is reserved for future use. The currently set value does not work. The reader currently uses the 400ms frequency hopping time by default.
Format of Data Field
| Field | Byte Length | Description |
|---|---|---|
| Option | 1 byte | Must be 0x01 |
| Hop time | 4 bytes | Frequency hopping time, in milliseconds |
Example
Example 1
Set Frequency Hopping Table, set three frequencies: 915250KHZ, 903250KHZ and 926750KHZ.
Host to Reader
| FF | 0C | 95 | 00 0D F7 32 | 00 0D C8 52 | 00 0E 24 1E | E5 24 |
|---|---|---|---|---|---|---|
| Header | Data Length | Command Code | 915250KHZ | 903250KHZ | 926750KHZ | CRC |
Example 2
Set Regulatory Hopping Time, set frequency hopping time to 256ms.
Host to Reader
| FF | 05 | 95 | 01 | 00 00 01 00 | 9E 73 |
|---|---|---|---|---|---|
| Header | Data Length | Command Code | Option | Hop time | CRC |