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XBee® Wi-Fi RF Modules

Serial Communication Service

The serial communication service connects an IP port to the serial peripheral (UART or

SPI) of the XBee. No additional formatting or header is required and data will be

transferred between the RF hardware and Serial Communication hardware as received.

The IP ports are configured using the C0 and DE commands. Note that port 0xBEE is

reserved for the XBee Application Service and should not be used for the Serial

Communication Service. The behavior of this service varies based on the mode of the

serial port and is discussed in the following sections.

Transparent Mode

Only one port is available and can be either UDP or TCP. It is configured through the IP

command. Data received by the service is sent to the serial port without any additional

processing.

UDP

When the IP command is configured for UDP, data received on the serial

port will be packetized and sent to the IP address specified by the DL

command and to the destination port specified by the DE command.

The source port is defined by the C0 command.

TCP

TCP provides for a connection based protocol. When in transparent

mode the module will only allow one connection at a time. A

connection can be initiated by a local host or by a network client.

A local host initiates a connection by sending data to the serial port. A

connection will be created based on the DL (IP address) and DE

(destination port) commands. However, if DL is a broadcast address,

then UDP will be used, ignoring the TCP configuration.

A network client establishing a TCP connection to the XBee will use the

port defined by the C0 command. When established any data sent by

the local host will not create a new connection based on DL and DE, but

rather the existing connection will be utilized.

API Mode

In API mode, the module will listen on both the UDP and the TCP ports at the same time.

The local host will utilize the IPv4 transmit frame to send data from the module and will

receive data through the IPv4 received frame. These frames give greater IP control and

visibility to the local host. See the API section for more information.

UDP packets are sent from the listening port on the sending module. If the listening

port number doesn't match the source port of the sender, the packet is reject

ed and not

sent. Also, if the specified IP address is a broadcast, it will be sent as a UDP packet,

whether or not TCP is specified in the API frame.

Digi XBee Manual

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