| 摘要 |
<p>The dual standard interface (1) has three optoelectronic universal asynchronous receiver-transmitter (UART) couplers (OP1,OP2,OP3) and a converting unit (12) which connects them to a transmission cable (8,9,11). The addition, to this standard RS485 interface, of a resistor (R9) connecting a supply voltage (Vcc) to a first electrode of the third optoelectronic coupler (EL), and a second resistor (R10) and cable connection (11) to the second electrode, enables RS232 transmission to be made</p> |
