Cypress Chameleon CTM-15X Manual do Utilizador descarregar pdf (Página 3)

3 CTM-15X PAD Operation

2 CTM-15X PAD Operation

Packet Assembly and Disassembly (PAD) is used for sending and receiving “raw” data over IP networks.

The modem takes care of establishing IP network connections, as well as the encapsulation of data within

UDP or TCP packets. This eliminates the need for a TCP/IP stack running on the host device.

This

application note details how to setup a CTM-15x cellular wireless data modem in PAD mode in order

to provide a communications link between a serial port end device and a central control application.

A PAD connection uses the CDMA

EVDO (Rev A) or the HSPA+ packet data network providing the

advantages of higher data rates for quicker response times, and always being connected. PAD mode

is typically used for supervisory control and data acquisition (SCADA) applications. PAD mode can be

used with master and slave devices that use proprietary communication protocols such as the Allen

Bradley DF1 or used to provide direct communications with field devices normally operated on a dial-

up modem connection.

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