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Programming RS-485
The majority communicative operation of the RS-485 is in the same of the RS-232.
When the RS-485 precedes the transmission, which needs control the TXC signal,
and the installing, steps are as follows:
Step 1: Enable TXC
Step 2: Send out data
Step 3: Waiting for data empty
Step 4: Disable TXC
Note: Please refer to the section of the “Serial Ports” in the Chapter 5 “Technical
Reference” for the detail description of the COM port’s register.
¾
Initialize COM port
Step 1: Initialize COM port in the receiver interrupt mode, and /or transmitter
interrupt mode. (All of the communication protocol buses of the RS-485
are in the same.)
Step 2: Disable TXC (transmitter control), the bit 0 of the address of 4
just sets “0”.
NOTE: Control the system “DTR” signal to the RS-485 TXC communication.
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Содержание FX5507
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