X24-019PKC-RA Digi International/Maxstream, X24-019PKC-RA Datasheet - Page 49
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X24-019PKC-RA
Manufacturer Part Number
X24-019PKC-RA
Description
MOD RF 2.4GHZ 19.2K RS232/485
Manufacturer
Digi International/Maxstream
Series
XStream™r
Specifications of X24-019PKC-RA
Function
Transceiver, Modem
Modulation Or Protocol
FHSS
Frequency
2.4GHz ~ 2.4835GHz
Applications
General Purpose
Interface
RS-232, RS-485
Sensitivity
-102dBm
Power - Output
17dBm (50mW)
Data Rate - Maximum
20 kbps
Voltage - Supply
5V
Package / Case
Module
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
© 2006 MaxStream, Inc. Confidential & Proprietary
XStream‐PKG‐R™ RS‐232/485 RF Modem – Product Manual v5.x00 [2006.02.24]
Initiating a Connection
Connection Guidelines:
Once in Multi-Streaming Mode (MD > 0), several events can initiate an exclusive connection:
1.
2.
3.
Initiating a Disconnection
To disconnect, the base modem sends a DGP (disconnect grant packet). A remote modem can
only request a disconnect. The following conditions cause a disconnect:
1.
2.
3.
4.
• A remote modem can only request a connection with the base modem.
• The base modem may hold off or grant a connection request to another modem.
• A remote modem will not try to establish a connection if one already exists.
• A connection fails if no response is received after RR (Retries) CRP packets. After a failure,
• A global connection cannot fail. [Definition is on next page.]
Remote modem has payload to transmit. After a remote modem receives data from its host,
the modem will attempt to establish a connection with the base modem. The connection is
defined by the remote’s DT (Destination Address) parameter. If another remote has a
connection with the base, no connection will be established until the connection runs its
course. Any remotes requesting a connection will then arbitrate for the next connection. RR
(Retries) and RN (Random back-off) parameters control this arbitration.
Base sets the DT (Destination Address) parameter. When the base modem sets the DT
(Destination Address) parameter, an exclusive connection is immediately initiated with the
remote modem that has a matching DT parameter. After the DT command is sent (If
ATCM=1), the base modem indicates a successful connection with a “CONNECT XXXX” string
where "XXXX" is the remote's address. An unsuccessful connection is indicated with an
“ERROR” string. If the connection is successful, the modem immediately exits AT Command
Mode and data can be sent to and received from the connected remote modem. If an error is
returned, the modem stays in AT Command Mode. If a base is connected to a remote when
the DT command is executed, the current connection is disconnected before a new
connection is created.
DI3 pin (pin 2, SLEEP) is asserted (set low). Both base and remote modems can create a
connection (defined by the current DT (Destination Address) parameter) when the DI3 pin is
asserted (driven high). DR (DI3 Configuration) Command is used to establish this mode. If a
remote asserts DI3, a connection request will be sent when no connection is active. If the
base asserts DI3, a connection will immediately be established with the remote after any
connection.
No over-the-air data sent or received for CE (Connection Inactivity Timeout) time. If no over-
the-air data is successfully sent (no acknowledgement received) or received (any good
packet) for CE time, the connection will be dropped. Only a base modem can detect this
condition. Refer to CE Command.
Absolute CB (Connection Duration Timeout). The CB parameter defines an absolute timeout.
A timer is started on the remote units when a connection is established. When the
connection has been active for CB time, the base will close the connection. A remote that
detects this condition will automatically disconnect (it will not send a DRP (disconnect
request packet)). Remotes that monitor a connection between the base and another remote
will disregard any connection after the CB time. Refer to CB Command.
DI3 pin (pin 2, SLEEP) is de-asserted (set high). A base or remote modem can cause a
disconnect by setting the DI3 line high. If no connection is active, the de-assertion is
ignored. A remote will request a disconnect if DI3 is de-asserted and the remote is currently
connected the base. Refer to DR (DI3 Configuration) Command.
A remote or a base modem receives the ATDC (Disconnect) Command.
whatever condition was causing a connection to be established is cleared. If the condition
was data to be sent, all data in the DI buffer will be flushed. If the condition was DI3
transition, then no connection will be attempted until another correct DI3 transition.
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