| 摘要 |
An apparatus for and method of serially transmitting a message between first and second devices (302, 304) coupled to a data or clock line (310) in a process control device (10) is disclosed. A first transition (212) of the data or clock signal is generated during a signal cycle. A second transition (214) of the signal is generated during the first signal cycle in order to control the duty cycle of the signal during the first signal cycle. If the duty cycle of the signal during the first signal cycle has a first value, then the first signal cycle is representative of a first data state transmitted between the first and second devices (302, 304). If the duty cycle of the signal during the first signal cycle has a second value, then the first signal cycle is representative of a second data state transmitted between the first and second devices (302, 304).
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