X09-009PKC-RA Digi International/Maxstream, X09-009PKC-RA Datasheet - Page 15

• Manufacturer Part Number: X09-009PKC-RA
• Description: MOD RF 900MHZ 9600BPS RS232/485
• Manufacturer: Digi International/Maxstream
• Series: XStream™r

Specifications of X09-009PKC-RA

• Function: Transceiver, FHSS
• Modulation Or Protocol: FHSS, FSK
• Frequency: 900MHz
• Applications: ISM
• Interface: RS-232, RS-485
• Sensitivity: -110dBm
• Power - Output: 20dBm (100mW)
• Data Rate - Maximum: 10 kbps
• Voltage - Supply: 7 V ~ 18 V
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

XStream‐PKG‐R™ RS‐232/485 RF Modem – Product Manual v5.x00 [2006.02.24]
Figure 3.4. Data Transmission Sequence
RF Data Packet
The RF packet is the sequence of data used for communicating information between MaxStream
Modems. An RF Packet consists of an RF Initializer and RF Data.
Figure 3.5. RF Data Packet Components
* When streaming multiple RF packets, the RF Initializer is only sent in front of the first packet.
RF Initializer
An RF initializer
is sent each time a new connection sequence begins. The RF initializer contains
channel information that notifies receiving modems of information such as the hopping pattern
used by the transmitting modem. The first transmission always sends an RF initializer.
An RF initializer can be of various lengths depending on the amount of time determined to be
required to prepare a receiving modem. For example, a wake-up initializer is a type of RF
initializer used to wake remote modems from Sleep Mode (Refer to the FH, LH, HT and SM
Commands for more information). The length of the wake-up initializer should be longer tha
n the
length of time remote modems are in cyclic sleep.
Header
The head
er contains network addressing information that filters incoming RF data. The receiving
modem checks for a matching Hopping Channel (HP parameter), Vendor Identification Number
(ID parameter) and Destination Address (DT parameter). Data that does not pass through all
three network filter layers is discarded.
CRC (Cyclic Redundancy Check)
To verify data integrity and provide b
uilt-in error checking, a 16-bit CRC (Cyclic Redundancy
Check) is computed for the transmitted data and attached to the end of each RF packet. On th
e
receiving end, the receiving modem computes the CRC on all incoming RF data. Received data
that has an invalid CRC is discarded [Refer to the Receive Mode section, next page].
© 2006 MaxStream, Inc. Confidential & Proprietary
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