| 摘要 |
<p>PURPOSE:To increase the amount of transmission with a synchronizing signal added with status information, by inverting logic of a synchronizing pattern signal according to ON/OFF state of a status signal at transmission side. CONSTITUTION:A status signal STS and an output signal of a synchronizing pattern signal generating circuit 102 controlled with a transmission controller 101 are EORed at an EX-OR gate 104, the logic of the status signal STS of a synchronizing pattern signal SYN is inverted with the state of ON/OFF (''1''/ ''0'') of the status signal STS, inputted to a multiplexer 100 and transmitted to an interface circuit 103 at the transmission side in matching with a data DT. A signal transmitted via a transmission line 300 is received at a reception side interface circuit 200, a demultiplexer 201 and a positive (negative) synchronizing discrimination circuit 203 (204). When the signal STS is the OFF(ON)-state, the circuit 203(204) discriminates the synchronizing pattern, the output goes to ''1'' and is applied to OR circuits 205 and 208. A reception control circuit 202 controls the demultiplexer 201. The state of OFF(ON) of the signal STS is displayed in the output of the OR circuit 208.</p> |
