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If its a 16F876 pin 17 is the /TXD output
Why pin 20, its +V supply to the PIC!, you want the Vss pin.
Can you post a link to the website where the program cam from.?
The 16F88 has a serial port which can be run in synchronous SPI mode
(3 wires), I2C mode (2 wires) or async (RS232). You just have to choose
the mode that can most easily be implimented on your module. The serial
port uses some of the pins that are currently allocated to the LCD. If
you don't need the LCD and switches, then just don't put those components
on the board! You could also disable the associated code in the software
(though this is not strictly necessary).
Again, check my tutorials, tutorial 11.4 reads a voltage, displays it on an LCD, and also sends it via RS232 (not requiring use of a hardware USART) - the actual display is under the control of two flags, so you can have it LCD only, RS232 only, or both - just by setting the flags.
It should be pretty easy to add a similar facility to the wattmeter code.