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API Operation Data bytes that need to be escaped:

XBee/XBee-PRO® S2C ZigBee® RF Module

152

Data bytes that need to be escaped:

Byte Description

0x7E Frame Delimiter

0x7D Escape

0x11 XON

0x13 XOFF

Example: Raw serial data before escaping interfering bytes:

0x7E 0x00 0x02 0x23 0x11 0xCB

0x11 needs to be escaped which results in the following frame:

0x7E 0x00 0x02 0x23 0x7D 0x31 0xCB

Note In the previous example, the length of the raw data (excluding the checksum) is 0x0002 and the

checksum of the non-escaped data (excluding frame delimiter and length) is calculated as:

0xFF - (0x23 + 0x11) = (0xFF - 0x34) = 0xCB.

Length

The length field specifies the total number of bytes included in the frame's data field. Its two-byte

value excludes the start delimiter, the length, and the checksum.

Frame data

This field contains the information that a device receives or transmits. The structure of frame data

depends on the purpose of the API frame:

Start

delimiter Length

Frame data

ChecksumAPI identifier

Identifier-specific Data

1 2 3 4 5 6 7 8 9 ... n n+1

0x7E MSB LSB

cmdID

cmdData

Single

byte

The cmdID frame (API-identifier) indicates which API messages contains the cmdData frame

(Identifier-specific data). The device sends multi-byte values big endian format.

The XBee/XBee-PRO ZigBee RF Module supports the following API frames:

API frame names API ID

AT Command 0x08

AT Command - Queue Parameter Value 0x09

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