Patent ID: 6760848
Filing Date: 2004-07-06
Classification: G06F,H03K

Abstract:
A converter for digital data transmission between an electrical interface of a first device and an electrical interface of a second device, the electrical interface of the second device configured as an RS-232 interface, the first device using a first high voltage level corresponding to a high logical state of the first device and a first low voltage level corresponding to a low logical state of the first device and the second device using a second high voltage level of approximately âˆ’12 volts corresponding to a high logical state of the second device and a second low voltage level of approximately +12 volts corresponding to a second low logical state of the second device, the first low voltage level having a lower absolute value than the second low voltage level and the first high voltage level having a lower absolute value than the second high voltage level, the converter comprising:a circuit for converting the first high voltage level to the second high voltage level and the first low voltage level to the second low voltage level wherein the circuit uses the second high voltage level and second low voltage level for the converting, the second low voltage is conveyed to the circuit over first data line of the circuit via a Request To Send output of the second device interface and the second high voltage level is conveyed to the circuit over a second data line via a Data Terminal Ready output of the second device interface, and wherein the circuit includes a switching member controllable by the logical state of the first device for connecting one of the first data line and the second data line with a data input line of the second device interface.