XT09-PKI-E Digi International/Maxstream, XT09-PKI-E Datasheet - Page 42

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XT09-PKI-E

Manufacturer Part Number
XT09-PKI-E
Description
MODEM RF 900MHZ 1W ETHER
Manufacturer
Digi International/Maxstream
Series
XTend™r
Datasheet

Specifications of XT09-PKI-E

Function
Transceiver, Modem
Modulation Or Protocol
FHSS, FSK
Frequency
900MHz
Interface
RJ-45 Ethernet
Sensitivity
-110dBm
Data Rate - Maximum
10 kbps
Voltage - Supply
7 V ~ 28 V
Package / Case
Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Power - Output
-
Applications
-
9XTend‐PKG‐E™ Ethernet RF Modem – Product Manual v2.x4x [2007.01.04]
4.4. API Operation
4.4.1. API Frame Specifications
API Operation (AP parameter = 1)
API Operation - with Escape Characters (AP parameter = 2)
By default, XTend 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 spec-
ifies 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 cor-
rectly 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.
© 2007 MaxStream, Inc., Confidential & Proprietary ‐ All Rights Reserved 
• 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 [refer to p18].
receiving modem(s) can distinguish between data coming from different remotes.
API modes are disabled.
MSB = Most Significant Byte, LSB = Least Significant Byte
MSB = Most Significant Byte, LSB = Least Significant Byte
Start Delimiter
Start Delimiter
(Byte 1)
(Byte 1)
0x7E
0x7E
MSB
MSB
(Bytes 2-3)
(Bytes 2-3)
Length
Length
LSB
LSB
Characters Escaped If Needed
API-specific Structure
API-specific Structure
Frame Data
Frame Data
(Bytes 4-n)
(Bytes 4-n)
(Byte n + 1)
(Byte n + 1)
Checksum
Checksum
1 Byte
1 Byte
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