X09-009PKC-RA Digi International/Maxstream, X09-009PKC-RA Datasheet - Page 14

• 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: -

Note: RF reception must
complete before the
modem is able to enter
into Transmit Mode.
© 2006 MaxStream, Inc. Confidential & Proprietary
XStream‐PKG‐R™ RS‐232/485 RF Modem – Product Manual v5.x00 [2006.02.24]
3.2. Modes of Operation
3.2.1. Idle Mode
3.2.2. Transmit Mode
RF transmission begins after either of the following criteria is met:
XStream RF Modems operate in five modes.
Figure 3.3. XStream Modes of Operation
Modem can only be in one mode at a time.
When not receiving or transmitting data, the modem is in Idle Mode. The modem uses the same
amount of power in Idle Mode as it does in Receive Mode.
The modem shifts into the other modes of operation under the following conditions:
After responding to any of the preceding conditions, the modem automatically transitions back
into Idle Mode.
When the first byte of serial data is received from the UART in the DI buffer, the modem
attempts to shift to Transmit Mode and initiate an RF connection with other modems. After
transmission is complete, the modem returns to Idle Mode.
1.
2.
After either RB or RO conditions are met, the modem then initializes a communications channel.
[Channel initialization is the process of sending an RF initializer that synchronizes receiving
modems with the transmitting modem. During channel initialization, incoming serial data
accumulates in the DI buffer.]
Serial data in the DI buffer is grouped into RF packets [refer to PK (RF Packet Size)]; converted
to RF data; then transmitted over-the-air until the DI buffer is empty.
RF data, which includes the payload data, follows the RF initializer. The payload includes up to
the maximum packet size (PK Command) bytes. As the transmitting modem nears the end of the
transmission, it inspects the DI buffer to see if more data exists to be transmitted. This could be
the case if more than PK bytes were originally pending in the DI buffer or if more bytes arrived
from the UART after the transmission began. If more data is pending, the transmitting modem
assembles a subsequent packet for transmission.
• Serial data is received in the DI Buffer (Transmit Mode)
• Valid RF data is received through the antenna (Receive Mode)
• Command Mode Sequence is issued (Command Mode)
• Sleep Mode condition is met (Sleep Mode)
RB bytes have been received in the DI buffer and are pending for RF transmission [refer to
RB (Packetization Threshold) command, p34].
The RB parameter may be set to any value between 1 and the RF packet size (PK), inclusive.
When RB = 0, the packetization threshold is ignored.
At least one character has been received in the DI buffer (pending for RF transmission) and
RO time has been observed on the UART [refer to RO (Packetization Timeout) command].
The timeout can be disabled by setting RO to zero. In this case, transmission will begin after
RB bytes have been received in the DI buffer.
14