PC-receive part of programming: PC serial port' s RTS by PTR2000 level conversion and the TXEN connected wireless MODEM. Computer to send data, RTS to logic 1, the effective, or PTRZ000 the Pin7 (TXEN) was set to 1, can send data at this time. Computer to receive data, RTS effective logic 0, or PTRZ000 the Pin7 (TXEN) was set to 0, to receive data at this time. PC-to receive some of the procedures described below:

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