A Simple Wifi Modem

If you have purchased a Wifi Modem from the Kennett Classic shop, here are some directions to get you started.

The modem is tested before sale and no assembly or configuration is required. Follow these directions to ensure proper operation.

  1. Make sure the wires are attached correctly between the red RS232 to TTL adapter and the ESP82660 modem (see picture). If the colors of the wires differs from the above picture restore the connections as pictured.
  2. Attach a straight through serial cable to the 9-pin female-end connector on the modem.  On the other end attach the serial cable to your computer or terminal.  If you chose a USB2Serial converter cable verify that it works correctly before attaching to your wifimodem, if possible.  USB2Serial cables are often a source of unnecessary frustration. You do not need a NULL Modem adapter in most cases.
  3. Attach microUSB cable and power source (either powered by a computer’s USB port, or a standalone USB power supply like a phone charger) to the modem but do not attach power on the other end yet.  If possible, obtain a power source that produces 200ma or more such as a USB 3.x port on your computer, or a quality phone charger.
  4. Set your computer or terminal COM settings to: 1200 baud 8/N/1 as this is what the WIFI modem is pre-configured to use too.  Verify that your computer or terminal is listening to the COM port.  Most communications software allow for the selection of a COM port. (COM1 COM2, etc.)
  5. Attach power to the modem by plugging into the power source
  6. Assuming the computer or terminal is ready, after a few seconds the following message will appear:

Zimodem Firmware v3.4
CoCoWiFi Version.
sdk=2.2.1(cfd48f3) chipid=1458415 cpu@80
totsize=4096k ssize=336k fsize=2880k speed=40m


  1. If the message above does not appear on your screen you can press the reset button on the modem to soft boot it.
  2. Use AT+CONFIG to run WIFI command to bring up the communications set up menu. Enable FLOW control and configure the other options to your intended environment.
  3. The AT Instruction Set is found here: https://github.com/bozimmerman/Zimodem
  4. FOR COMMODORE LEAVE AT 1200, BUT TO CHANGE TO 9600 FOR OTHER COMPUTERS (Do not include quote marks substituting n,x,Y,z as desired):
  5. ATB”n,xYz” : Sets baud rate n, bits x, parity (E,O,M, or N) for Y, and stop bits
  6. More AT Commands:

AT&W : Saves the current configuration: WiFi settings(ATW), baud rate (ATB), end of line (ATR) settings, flow control (ATF), echo mode (ATE), extended responses (ATX), verbose responses (ATV), quiet responses (ATQ), PETSCII mode (AT&P1), pin statuses (ATS46 – S58), Rings (ATS0), Listener Stream-mode (ATS41), and Listener restore (ATS60)

Have fun!

If you’re stuck, we got the modem flash build file for this configuration device here and we greatly appreciate the help.