CL4790-1000-232 Laird Technologies, CL4790-1000-232 Datasheet - Page 12

• Manufacturer Part Number: CL4790-1000-232
• Description: TXRX 900MHZ RS232 1W W/ANT DB9
• Manufacturer: Laird Technologies
• Series: AeroCommr

Specifications of CL4790-1000-232

• Function: Transceiver
• Modulation Or Protocol: FHSS, FSK
• Frequency: 902MHz ~ 928MHz
• Applications: General Purpose
• Interface: RS-232
• Sensitivity: -99dBm
• Power - Output: 1000mW
• Data Rate - Maximum: 115.2kbps
• Voltage - Supply: 7 V ~ 18 V
• Package / Case: Module
• Wireless Frequency: 900 MHz
• Interface Type: RS-232, RS-485
• Board Size: 121 mm x 70 mm x 30 mm
• Modulation: FHSS, FSK
• Security: 1 byte System ID, DES
• Operating Voltage: 100 V to 120 V
• Output Power: 1000 mW
• Antenna: Dipole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

CL4790 User’s Manual
Note: The Straight Through Cable provided with the CL4790 has female connectors on both
ends and the Crossover cable has a male connector at one end and a female connector at the
other end. Please use a male-to-male adapter or female-to-female adapter wherever required.
Using a null modem adapter with a Crossover cable is equivalent to using a Straight Through
cable.
2.2
The RS-485 interface uses a Differential Data Transmission that can help nullify the effects of
ground shifts and induced noise signals that can appear as common mode voltages on a
network.
The CL4790 implements a RS-485 (2-wire Half Duplex) multi-drop interface. Typically, a RS-485
bus will consist of a master and several slaves. The nodes will have unique addresses and can
send addressed packets to specific nodes. Because the bus is half duplex, no two nodes should
try to talk at the same time. The CL4790 does not have a RS-485 address, therefore, it will
transmit all RS-485 traffic over the RF. Conversely, as soon as a CL4790 receives a packet over
the RF, it will transmit the packet over the RS-485 bus.
Note: When using RS-485 (2-wire Half Duplex), a RS-485 to RS-232 converter is required to
configure the unit. AeroComm recommends a B&B Electronics 4WSD9R converter to translate
RS-485 to RS-232.
6/24/2005
RS-485 (2-wire Half Duplex)
OEM Host
DCE
DCD
TXD
GND
DSR
DTR
RI
RXD
CTS
RTS
Figure 7- DCE to DCE Interface
NC
NC
Crossover Cable
NC
NC
TXD
RXD
DTR
DCD
DSR
GND
CTS
RTS
RI
CL4790 Modem
DCE
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