VT132 Operation Manual (Draft)


It is assumed you have already successfully assembled a working RC2014 and know what you are doing in this respect. The silkscreen on the PCB along with the details provided in the VT132 Bill-of-Materials should provide sufficient information to assemble a working VT132.

The production VT132 comes pre-flashed with a working firmware image. Firmware updates are published on the GitHub repository along with instructions on how to flash new firmware.

NVR (Non-volatile RAM) is not initialized on a new VT132

  • At power-on or reset, following the 'Wait' message, a new VT132 will display 'Error' along with a series of bells
  • This is expected because the NVR has not been initialized
  • Once you write settings to the NVR (see Setup Screens) this error should not persist

Hardware reset

  • The hardware 'Reset' press button on the PCB reboots the ESP32 (EN line reset)
  • This will cause both the VT100 terminal and the modem to reset
  • and will lose any unsaved settings on both devices

Hardware configuration

There is minimal hardware configuration that needs to be performed on the VT132

For normal operation on the RC2014 Pro bus (or similar) both the Port A and Port B UARTS from an existing serial card (RC2014 Dual Serial, or similar) should be enabled by placing shunts on the 4 jumpers JP1 to JP4 (RxA/TxA and RxB/TxB)

The FTDI Program 6-pin header on the top of the PCB is not connected to Port A on the RC2014 Pro bus. It is connected to a separate UART on the ESP32 and is only used for

  • updating/re-flashing the firmware on the ESP32
  • monitoring debug logs from the ESP32
  • future expansion

The Modem Port B 6-pin header on the top of the PCB is connected to Port B Rx/Tx lines on the RC2014 Pro bus. In addition it:

  • provides RTS/CTS flow-control lines, when enabled for the modem
  • is designed to be compatible with serial cards such as the SC104 Z80 SIO/2 Module or similar

If you want to provide power to, or take power from either of the 6 pin headers then JP5 and JP6 will provide power or isolate the Vcc pin in the FTDI Program and Modem Port B 6-pin headers respectively.


You should normally only connect one power source to the system at a time.

VT100 (enhanced) Operator Information

VT100 (enhanced) Programmer Information

'AT' (Hayes) Serial Modem Operation Manual

Last Updated: 6/14/2020, 9:33:14 AM