SiK AT Commands
The RFD900 modem can support the Hayes ‘AT’ modem command set for configuration. The AT command mode can be entered by using the ‘+++’ sequence. When doing this, you have to wait for 1 second before and after entering the command mode in order to prevent data being interpreted as data. When you are successfully in the AT command mode, an ‘OK’ prompt will be displayed on the screen and the RFD900 modem will stop displaying information from the other modem. Whilst in AT mode, you can use the AT commands to control the local RFD900 modem or the RT commands to control the remote modem.
| AT Command | Description |
|---|---|
| ATI | Shows the radio version |
| ATI2 | Shows the board type |
| ATI3 | Shows board frequency |
| ATI4 | Shows board version |
| ATI5 | Shows all user settable EEPROM parameters |
| ATI6 | Displays TDM timing report |
| ATI7 | Displays RSSI signal report |
| ATO | Exits AT command mode |
| ATSn? | Displays radio parameter number ‘n’ |
| ATSn=X | Sets radio parameter number ‘n’ to ‘X’ |
| ATZ | Reboots the radio |
| AT&W | Writes current parameters to EEPROM |
| AT&F | Resets all parameters to factory defaults |
| AT&T=RSSI | Enables RSSI debugging report |
| AT&T=TDM | Enables TDM debugging report |
| AT&T | Disables debugging report |
The next table that gives a list of RT commands and their description. The x parameter is optional where x is the node ID. For example: use RTI,1 to get RTI value for node 1 or simply use RTI to get the RTI value for the node set in the local NODEDESTINATION.
| AT Command | Description |
|---|---|
| RTI[,x] | Shows the radio version. |
| RTI2[,x] | Shows the board type |
| RTI3[,x] | Shows board frequency |
| RTI4[,x] | Shows board version |
| RTI5[,x] | Shows all user settable EEPROM parameters |
| RTI6[,x] | Displays TDM timing report |
| RTI7[,x] | Displays RSSI signal report |
| RTO[,x] | Exits AT command mode on the remote node |
| RTSn? [,x] | Displays radio parameter number ‘n’ |
| RTSn=X[,x] | Sets radio parameter number ‘n’ to ‘X’ |
| RTZ[,x] | Reboots the radio |
| RT&W[,x] | Writes current parameters to EEPROM |
| RT&F[,x] | Resets all parameters to factory defaults |
| RT&T=RSSI[,x] | Enables RSSI debugging report |
| RT&T=TDM[,x] | Enables TDM debugging report |
| RT&T[,x] | Disables debugging report |
To set certain registers to a particular value, follow these steps:
1. Use the command ATSn=X where n is the register number and X is the actual value.
2. Use the command AT&W to write the new values to the RFD900 modem.
3. Use the command ATZ to reboot the RFD900 modem.
| S Reg # | S Register | Description | Default Val | Max Val | Min Val | Should be the same at both ends of the link for successful communication ? |
|---|---|---|---|---|---|---|
| 0 | FORMAT | This is for EEPROM version, it should not be changed | Firmware dependant | N/A | N/A | No |
| 1 | SERIAL_SPEED | Serial speed in ‘one byte form’ | 57 | 115 | 2 | No |
| 2 | AIR_SPEED | Air data rate in one byte form | 64, 1281 | 250 | 2 | Yes |
| 3 | NETID | Network ID. | 25 | 499 | 0 | Yes |
| 4 | TXPOWER | Transmit power in dBm. Maximum is 30dBm | 20, 271 | 30 | 0 | No |
| 5 | ECC3 | Enables or disables the golay error correcting code | 1, 01 | 1 | 0 | Yes |
| 6 | MAVLINK4 | Enables or disables the MAVLink framing and reporting | 1, 01 | 1 | 0 | No |
| 7 | OP_RESEND5 | Opportunic Resend | 1, 01 | 1 | 0 | No |
| 8 | MIN_FREQ | Min freq in KHz | 915,000 | 927,000 | 902,000 | Yes |
| 9 | MAX_FREQ | Max freq in KHz | 928,000 | 928,000 | 903,000 | Yes |
| 10 | NUM_CHANNELS | Number of frequency hopping channels | 50, 201 | 50 | 5 | Yes |
| 11 | DUTY_CYCLE | The percentage of time to allow transmit | 100 | 100 | 10 | No |
| 12 | LBT_RSSI | Listen before talk threshold | 0 | 1 | 0 | Yes |
| 13 | MANCHESTER | Manchester encoding | 0 | 1 | 0 | Yes |
| 14 | RTSCTS | Ready To Send and Clear To Send | 0 | 1 | 0 | No |
| 15 | NODEID2 | Node ID. Base node ID is 0. One node must be acting as a base for a multipoint environment to work. NODECOUNT must be updated first before updating this parameter with bigger number. | 21 | 29 | 0 | N/A |
| 16 | NODEDESTINATION2 | Remote node ID to communicate with. Set the value to 65535 to broadcast to all nodes. Cannot be the same as NODEID. NODECOUNT must be updated first before updating this parameter with bigger number. |
655351 | 29 | 0 | No |
| 17 | SYNCANY2 | If set to 1, allows the modem to send data to all non-base nodes without finding the base. It is strongly recommended to set the value to 0 to avoid unwanted data communication confusion on a multipoint environment. | 01 | 1 | 0 | No |
| 18 | NODECOUNT2 | The total number of nodes. | 31 | 30 | 2 | Yes |
Notes:
1Defaults for firmware version 2.* and later
2Available only for firmware version 2.* and later
3ECC – Software Detection and correction, extra packet information (twice the packet length) is sent to allow the recovery of corrupted packets.
4Injects RSSI packet when Mavlink protocol used and heartbeat packet detected.
5Opportunistic resend allows the node to resend packets if it has spare bandwidth.