The preceding statement must be included as a CAUTION statement in manuals for OEM products to alert users on FCC RF Exposure compliance. Caution: Any change or modification not expressly approved by AeroComm could void the user’s authority to operate the equipment. 6/21/2005...
Reliable communication up to 115.2Kbps Overview The CL4424 uses Frequency Hopping Spread Spectrum modulation, where the units “hop” from frequency to frequency many times per second using a specific hop pattern applied to all the transceivers in the same network. A distinct hopping pattern is provided for each Channel Number, thereby allowing multiple networks to co-exist in the same area without interference.
CL4424 User’s Manual CL4424 Specification Specifications CL4424 TRANSCEIVER PERFORMANCE Output power (w/ 3dBi antenna) 100mW Transmission range Up to 500 feet (450m) indoors; Up to 1 mile (1.6 km) line-of-sight Data rate Up to 115.2 Kbps RF Data Rate 576kbps fixed...
CL4424 User’s Manual CL4424 Interface CL4424 transceivers support RS-232/ RS-485 (2-wire Half Duplex) protocols. In a cabled environment, the RS-485 protocol can tolerate high noise and push signals over long cable lengths. RS-485 cabling can also communicate as far as 4000 feet (1200m) and offer multi-drop capability where up to 32 nodes can be connected.
CL4424 User’s Manual RS-232 Pin Assignments Figure 2- RS-232 CL4424 Back View RS-485 (2-wire Half Duplex) Terminal Block Pin Assignments Figure 3- RS-485 CL4424 Back View Terminal Block Note: Standard power is applied through the power connector. Alternative power is available via the terminal block pins.
9 Pin Male D-Connector Power Jack w/ 0.100 dia. pin and 0.250 opening, pin is PWR. 0.375 0.000 6/21/2005 Figure 4- CL4424 Mechanical Diagram Side View Label Recess, 3.5w x 2.0h Top View Note: All dimension in inches unless noted Antenna Connector SMA Jack, Reverse Polarity 0.538...
CL4424 User’s Manual 2. Interfacing Protocol The CL4424 is a DCE (Data Communications Equipment). A DCE can be interfaced to a DTE using a straight through serial cable (the serial cable provided with the CL4424 is a straight through cable). Typically, PC’s are defined as a DTE and peripherals are defined as DCE. To interface a DCE with another DCE, or a DTE with another DTE, a null modem (or a Crossover) cable is required.
CL4424 User’s Manual RS-232 RS-232 is a single ended data transmission protocol. The RS-232 signals are represented by voltage levels with respect to a system common (power / logic ground). The "idle" state (MARK) has the signal level negative with respect to common, and the "active" state (SPACE) has the signal level positive with respect to common.
Because the bus is half duplex, no two nodes should try to talk at the same time. The CL4424 does not have a RS-485 address, therefore, it will transmit all RS-485 traffic over the RF. Conversely, as soon as a CL4424 receives a packet over the RF, it will transmit the packet over the RS-485 bus.
Hardware Flow Control Often, the host device can send data to the CL4424 faster than it can be sent over the RF. The CL4424 has a 256 byte buffer to store data before sending it over the RF. If the host device is sending data faster than the CL4424 can send it out, eventually, the buffer will fill up.
This allows for the creation of a wireless network consisting of multiple nodes. By programming each CL4424 with a network specific Channel Number and System ID multiple networks can be created as shown below.
The SDK Software and AC4424 User’s manual can be found on the Connex Tools and Literature CD or on the website at http://www.aerocomm.com/. Installation Locate the CL4424 Configuration Utility, 900 MHz link in the Software section of the Connex Tools & Literature CD. This software is also available at http://www.aerocomm.com/Software/ConnexLink_4424.zip.
Random Back Off: In an asynchronous network where any node can talk at any time, the CL4424 can be programmed to use Random Back Off to mitigate the RF Link. If two nodes try to send packets at the same time, the packets will collide over the RF and will not be received by the destination node.
It will designate each port it finds by displaying the full Windows identifier for the port. Select the port that is connected to the CL4424 unit. Baud Rate: Must be equal to the Interface Baud Rate setting of the CL4424 unit that is to be configured.
8. Change desired settings. 9. After all changes have been made, select Write Radio to save the changes. 10. Cycle Power to the unit after all changes has been saved. This will set the CL4424 unit to its normal mode of operation.
Solution Verify the PC Settings. See Section 4.2.3 PC Settings. Make sure the CL4424 unit uses the right serial cable. Refer to Section 2.1 RS-232. If any other program is running and is using the same COM port as the CL4424, close that program and try to read the radio again.
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