Send SMS instructions to the device and the device does not response
1.Look at the flashing of the signal light to determine whether the device has registered the signal;
2. Is there any error in the device password, default 1234, if it has been changed in the configuration software, the new password should be used;
3. Is there any error in the short message instruction? Notice that there is no "+", and "#" is under the English input method;
4. Whether the mobile phone card in the device has the SMS function enabled;
5. If you use SMS APP to send short messages to the device without reply, please check whether the mobile phone has the right to send short messages and make phone calls to SMS APP.

The device has triggered an alarm but does not send an alarm message/call
1. The device is not "armed". Please use the SMS command or the configuration software to "arm".
2, the battery voltage is too low, can not send text messages, please connect the external power supply to charge the device;
3. The format of the telephone number is incorrect, and the country code should be added, for example, China is 0086.
4. The GSM signal is too low;
5. The SIM card in the device is in arrears.

The device is not online
  a. Check if the networking parameters of the device on the configuration software are set correctly (including server IP/port/registration package content, etc.);
  b. Whether the SIM card in the device has a balance;
  c. Whether the SIM card in the device supports the traffic function or whether the traffic is directed traffic;
  d. Check whether the IP or registration package on the configuration software is correct. Pay attention to the front, back, and middle without spaces.
  e. Is the device ID setting incorrect?
  f. The device is not registered to the signal or the signal value is too weak. The antenna should be connected.

The data point of the device cannot read the correct data on the cloud platform.
  a. If you use the King Pigeon 2.0 cloud platform, the register address should be offset +1 (for example: the register address is 1, then you need to fill 2 on the King Pigeon 2.0 cloud platform);
     If you use the King Pigeon 3.0 cloud platform, the register address does not need to be offset (for example, the register address is 1, then you need to fill in 1 on the King Pigeon 3.0 cloud platform);
  b. Make sure that the data format/byte order settings are correct (for example, 32 bits are symbolic or unsigned or floating-point, byte order is ABCD or BACD, etc.)

S257's current, voltage and other parameters are displayed incorrectly on the display.
If a current transformer is connected, the CT value must be set directly on the panel (see page 43 of the manual) or in the configuration software (see pages 29-30 of the manual).

S257's current, voltage and other parameters are displayed incorrectly on the cloud platform.
If the current transformer is connected, calculate the CT value according to the proportional relationship and set it on the cloud platform. See page 64 of the manual for the proportional relationship. For example, if the CT value is 80, then the minimum, maximum, minimum original value and maximum original values should be set to 0-1-0-12.5 in turn.