Cypress Chameleon CTM-15X Manual do Utilizador descarregar pdf (Página 14)

14 Example Modem PAD Configuration

In this example, the master device requires some scripting or programmable functionality to perform the

following actions iteratively for polling data from slave devices:

1. Detect the modem’s command mode by checking that the pound character (#) is received on the

serial port

2. Execute cmd padip using the field device’s IP address

3. Execute cmd padport using the field device’s port

4. Execute cmd pad to start PAD operation

5. Send the current field device request over the serial port

6. Wait for the response from the field device. In this example, the modem should drop back into

command mode after 10 seconds.

5.4 Modem PAD Configuration for a Reporting Field Device

In this example, a Chameleon modem is connected to a field device that reports to a remote server

without the need to be polled. The field device generates data on the serial port whenever it is available

and the modem will send this data remotely over-the-air. The remote field device operates at a baud rate

of 9600 and uses hardware flow control. The field device generates ASCII data with varying length and is

always terminated with the carriage return character <CR>. The field device does not require echoing of

data that it sends to the modem.

For the modem connected to the reporting field device, enter the following commands from the

serial console:

cmd factory

cmd mode 4

cmd port 9600 8 n 1 2

It will now be necessary to adjust the baud rate of the terminal application to 9600.

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Cypress Chameleon CTM-15X Manual do Utilizador Página 14