Innovative Technology
for a Connected World
AC4490
900MHz Radio Module
FLEXIBLE RF PROTOCOL
Laird Technologies’ embedded transparent protocol simplies the OEM’s integration process by utilizing drop-in installation. As
each radio module receives raw data, it manages its over-the-air protocol to assure successful communication. Headers, data packet
length, and CRCs are not required. The RF232 supports simple cable-replacement to complex peer-to-peer congurations, broadcast
communication to all radio modules or address packets to a specic destination using unique MAC addresses embedded in
each radio module.
LWS-SPEC-AC4490 0109
Any information furnished by Laird Technologies and its agents is believed to be accurate and reliable. Responsibility for the use and application of Laird Technologies materials
rests with the end user since Laird Technologies and its agents cannot be aware of all potential uses. Laird Technologies makes no warranties as to the tness, merchant-
ability, or suitability of any Laird Technologies materials or products for any specic or general uses. Laird Technologies shall not be liable for incidental or consequential
damages of any kind. All Laird Technologies products are sold pursuant to the Laird Technologies terms and conditions of sale in effect from time to time, a copy of which will
be furnished upon request. For further information please visit our website at www.lairdtech.com. Alternatively contact: wirelessinfo@lairdtech.com. Bluetooth
®
is a trademark
owned by Bluetooth SIG, Inc., USA and licensed to Laird Technologies.
© 2009 All Rights Reserved. Laird Technologies is a registered trademark of Laird Technologies, Inc..
SPECIFICATIONS
Parameter AC4490(LR)–1000
Interface 20-pin mini connector
Frequency (software selectable) 902-928 MHz (U.S)**
Modulation FHSS FSK
Serial interface options 3V TTL
Serial interface data rate Up to 115.2 Kbps
Output power (w/ 3dBi antenna)
10mW-1000mW variable
Current consumption†† 650 mA typical
Channels Up to 32 (U.S.)**
Security One-byte system ID, DES
Voltage pin 10: 3.3V-5.5V
pin 11: 3.3V +/-3%
Sensitivity
AC4490-1000: -100 dB
AC4490LR-1000: -110 dB
(Long Range mode)
Range Up to 20 miles (32 km)
Temperature -40º to +80ºC
Humidity (non-condensing) 10% to 90%
Dimensions 1.90 x 1.65 x 0.20“
(49 x 42 x 5 mm)
Weight < 0.75 oz (< 21 g)
Antenna External dipole
*The 900MHz frequency band is approved in the Americas and Australia as an unlicensed spectrum subject to
approval by device.
**For products and specications suited to non-U.S. countries (e.g. Australia and Europe), please contact Laird
Technologies directly.
†Although AC4490 radios will not talk to AC4424 radios, socket-compatibility allows for interchanging the
modules network-wide.
††Current consumption assumes 50% transmitter on-time.
RF PROTOCOL MODES
a) Communication
Unicast (one-to-one addressing)
Broadcast (one-to-multiple addressing)
b) Acknowledgement mode (ACK)
API with hardware and/or software
ACK indication
c) One-beacon mode
d) Dynamic radio data table:
Retains data from up to
12 radio modules
INTERFACE PROTOCOL
a) On-the-y radio module conguration:
Destination address
RF transmit power
Co-located servers
RF channel
Broadcast/addressed
b) Raw data or transmit/receive API
c) 9-bit serial interface mode
d) Long range mode, enables
sensitivity control
e) Generic A/D, D/A generic I/Os
f) Variable baud rate
g) RF packet size, timeout control
h) Onboard temperature sensor
i) Handshaking, CTS/RTS,
full modem-mode available
j) In-range indicator
k) Error detection
Onboard CRC
Duplicate packet ltering
l) Data encryption standard (DES)
The details contained within the document are
subject to change. Download the product specication
from www.lairdtech.com/wireless for the most current
specication.
