EZPLCs available from Balmoral Technologies (13/03/2009)... modules are 12 bit and have 0V - 5V, 0V - 10V, 4 mA - 20mA, or 0mA - 20mA options.The EZPLCs come with two serial communication ports on every model. Port 1 is RS232, which can beused for programming and connecting to an operator interface. Port 2 ...