Digi RCM4000 user manual User’s Manual

Models: RCM4000

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SIMPLE5WIRE.C—This program demonstrates 5-wire RS-232 serial communication with flow control on Serial Port D and data flow on Serial Port C.

To set up the Prototyping Board, you will need to tie TxD and RxD together on the RS-232 header at J4, and you will also tie TxC and RxC together using the jumpers supplied in the Development Kit as shown in the diagram.

RxC TxC

J4

TxD RxD GND

Once you have compiled and run this program, you can test flow con-

trol by disconnecting TxD from RxD while the program is running. Characters will no longer appear in the STDIO window, and will display again once TxD is connected back to RxD.

If you have two Prototyping Boards with modules, run this sample program on the sending board, then disconnect the programming cable and reset the sending board so that the module is operating in the Run mode. Connect TxC, TxD, and GND on the sending board to RxC, RxD, and GND on the other board, then, with the programming cable attached to the other module, run the sample program. Once you have compiled and run this program, you can test flow control by disconnecting TxD from RxD as before while the program is running.

SWITCHCHAR.C—This program demonstrates transmitting and then receiving an ASCII string on Serial Ports C and D. It also displays the serial data received from both ports in the STDIO window.

To set up the Prototyping Board, you will need to tie TxD and RxC together on the RS-232 header at J4, and you will also tie RxD and TxC together using the jumpers supplied in the Development Kit as shown in the diagram.

RxC TxC

J4

TxD RxD GND

Once you have compiled and run this program, press and release

switches S2 and S3 on the Prototyping Board. The data sent between the serial ports will be displayed in the STDIO window.

User’s Manual

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Digi RCM4000 user manual User’s Manual