CL4790-1000-232 Laird Technologies, CL4790-1000-232 Datasheet - Page 19

• 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
Consider the example of a remote temperature monitoring system where temperature readings
are obtained from sensors attached to the transceivers at remote locations. This application may
require polling each and every transceiver individually and obtaining the temperature reading.
When the Transmit API is enabled the packets are dynamically routed with out requiring any
configuration i.e. change the destination address every time the packet is transmitted. This
makes it easy when hundreds of transceivers need to be polled.
Send Data Complete
upon receiving an RF Acknowledge from the remote transceiver or exhausting all attempts.
When the Send Data Complete is enabled an RF Acknowledge is received for every packet that
has been transmitted. This would be very useful in cases where the information sent is vital and
OEM Host needs to retry and send the message again in case of a failure.
Receive API
When Receive API is enabled; upon receiving a packet the radio sends its OEM Host the packet
in the following format.
6/24/2005
When Send Data Complete is enabled, the transceiver sends the OEM Host the following data
1) The RSSI is how strong the remote transceiver heard the local transceiver, RSSI*
2) Successful RF Acknowledge updates the Success/Failure bit.
3) When the transceiver is transmitting Broadcast Packets it will always return
4) API Send Data Complete can be used as a software send data complete
5) The transceiver could receive a failure even though the packet was received as it
is how strong the local transceiver heard the remote transceiver.
success after exhausting all Broadcast Attempts.
indicator
could have missed the RF Acknowledge from the remote transceiver.
The RSSI is how strong the remote transceiver heard the local transceiver, RSSI* is how strong the
local transceiver heard the remote transceiver.
82h
81h
Payload Data
Length
01h: Success
00h: Failure
RSSI
RSSI
RSSI*
RSSI *
MAC (2,1,0)
Destination
Payload Data
19