Programming Rs-485; Initialize Com Port - FabiaTech FX5634 Fanless Series User Manual

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FabiaTech Corporation

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 RTS

Step 2:

Send out data

Step 3:

Waiting for data empty

Step 4:

Disable RTS

Note: Please refer to the section of the "Serial Ports" in the Chapter 5 "Technical

Reference" for the detail description of the COM ports register.

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 1 of the address of offset+4

just sets "0".

NOTE: Control the FX5634 system "RTS" signal to the RS-485 TXC communication.

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