XBP24-PKI-001-RA Digi International/Maxstream, XBP24-PKI-001-RA Datasheet - Page 50

• Manufacturer Part Number: XBP24-PKI-001-RA
• Description: MODULE 802.15.4 RS-232 ANT
• Manufacturer: Digi International/Maxstream
• Series: XBEE-PRO™r

Specifications of XBP24-PKI-001-RA

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: Home/Building Automation, Industrial Control, ZigBee™
• Power - Output: 0dBm
• Sensitivity: -92dBm
• Voltage - Supply: 2.8 V ~ 3.4 V
• Current - Receiving: 55mA
• Data Interface: Connector, Female DB-9
• Antenna Connector: RP-SMA
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Memory Size: -
• Current - Transmitting: -
• Other names: Q3255595

© 2008 Digi International, Inc.
XBee‐PRO PKG‐R® RS‐232 RF Modem – 802.15.4 ‐ Product Manual v1.xAx
4.4. API Operation
Start Delimiter
(Byte 1)
0x7E
4.4.1. API Frame Specifications
API Operation (AP parameter = 1)
API Operation - with Escape Characters (AP parameter = 2)
By default, XBee-PRO RF Modems act as a serial line replacement (Transparent Operation) - all
UART data received through the DI pin is queued up for RF transmission. When the modem
receives an RF packet, the data is sent out the DO pin with no additional information.
Inherent to Transparent Operation are the following behaviors:
As an alternative to the default Transparent Operation, API (Application Programming Interface)
Operations are available. API operation requires that communication with the modem be done
through a structured interface (data is communicated in frames in a defined order). The API
specifies how commands, command responses and modem status messages are sent and received
from the modem using a UART Data Frame.
Two API modes are supported and both can be enabled using the AP (API Enable) command. Use
the following AP parameter values to configure the modem to operate in a particular mode:
Any data received prior to the start delimiter is silently discarded. If the frame is not received
correctly or if the checksum fails, the data is silently discarded.
When this API mode is enabled (AP = 1), the UART data frame structure is defined as follows:
Figure 4‐03. UART Data Frame Structure:
When this API mode is enabled (AP = 2), the UART data frame structure is defined as follows:
Figure 4‐04. UART Data Frame Structure ‐ with escape control characters:
Escape characters. When sending or receiving a UART data frame, specific data values must be
escaped (flagged) so they do not interfere with the UART or UART data frame operation. To escape
an interfering data byte, insert 0x7D and follow it with the byte to be escaped XOR’d with 0x20.
• If modem parameter registers are to be set or queried, a special operation is required for
• In point-to-multipoint systems, the application must send extra information so that the
• AP = 0 (default): Transparent Operation (UART Serial line replacement)
• AP = 1: API Operation
• AP = 2: API Operation (with escaped characters)
transitioning the modem into Command Mode.
receiving modem(s) can distinguish between data coming from different remotes.
API modes are disabled.
Start Delimiter
MSB
MSB = Most Significant Byte, LSB = Least Significant Byte
MSB = Most Significant Byte, LSB = Least Significant Byte
(Byte 1)
0x7E
(Bytes 2-3)
Length
LSB
MSB
Characters Escaped If Needed
(Bytes 2-3)
Length
API-specific Structure
LSB
Frame Data
(Bytes 4-n)
API-specific Structure
Frame Data
(Bytes 4-n)
(Byte n + 1)
Checksum
1 Byte
(Byte n + 1)
Checksum
1 Byte
50