Ensure that your comport, modem attached, has a bit rate of 38400 and that the flow control is set to “none”; Check the comports VCC to be measured not less... read more →
Power , environmental and ground issues: Ensure proper –steady voltage feed to the Telephone unit sheafed within its own cable; Ensure that the ground wire is a 18AWG/Stranded ( minimum)... read more →
USB/RS485 module and Rs485 bus is connected together. The USB/RS485 Module connection to the PC should be one-to-one connected and not mutually connected to the main RS485 BUS; Separate the... read more →
Power/Firmware related: Replace the power supply with a 40VA power supply and ensure that it is not shared with any other loads; and Update the firmware.
Load/MIC issue through wear and tear and or power variance: Remove all additional loads feeding from the board ( Cameras,attached module, etc); Place a call, if it did not change,... read more →
The ribbon and or the keypad issue: Power recycle the unit then try to connect: If the unit comes back online, then Key pad or ribbon connector will require change-out... read more →