AC4490-200M-485 Laird Technologies, AC4490-200M-485 Datasheet - Page 15

• Manufacturer Part Number: AC4490-200M-485
• Description: TXRX 900MHZ 3.3-5.5V TTL 200MW
• Manufacturer: Laird Technologies
• Series: AeroCommr

Specifications of AC4490-200M-485

• Frequency: 902MHz ~ 928MHz
• Data Rate - Maximum: 115.2kbps
• Modulation Or Protocol: FHSS, FSK
• Applications: AMR, Fire & Security Alarms, Telemetry
• Power - Output: 5mW ~ 200mW
• Sensitivity: -110dBm
• Voltage - Supply: 3.3V, 5V
• Current - Transmitting: 68mA
• Data Interface: Connector, 2 x 10 Header
• Antenna Connector: MMCX
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Wireless Frequency: 900 MHz
• Interface Type: 20-pin mini connector
• Modulation: FHSS, FSK
• Security: 1 byte System ID, DES
• Operating Voltage: 3.3 V to 5.5 V
• Output Power: 200 mW
• Antenna: Integral and External Dipole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Current - Receiving: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AC4490 User’s Manual
R e c e i v e M o d e
When a transceiver is not in Transmit or Command mode, it will be in Receive Mode listening for data. While in
Receive Mode, subsequent data of up to 80 bytes can be received every hop (20 ms).
C o m m a n d M o d e
A radio will enter Command Mode when data is received over the serial interface from the OEM Host and either the
Command/Data pin (pin 17) is logic Low or the received data contains the “AT+++” (Enter AT Command Mode)
command. Once in Command Mode, all data received by the radio is interpreted as command data. Command Data
can be either EEPROM Configuration or On-The-Fly commands.
Discard Packet
Yes
Send Packet over
Receive full
check CRC
packet and
Duplicate
Packet
RF
F i g u r e 1 : P e n d i n g R F a n d D a t a i n B u f f e r F l o w
Yes
Yes
Receive Mode
Pending RF
Broadcast
Received
Packet
Send Packet over
RF
Addressed Packet
Validate CRC
Destination
Matching
Duplicate
Packet
MAC
Yes
Yes
www.aerocomm.com
Acknowledge
Send RF
Yes
Discard Packet
Com mand/Data
Mode
Broadcast Packet
Transm it Packet
Attem pts = 0
Decrement
Broadcast
Broadcast
Attem pts
Receive M ode
Data in Buffer
T H E O R Y O F O P E R A T I O N
Pin 17 Low
RF Data
AT+++
Addressed Packet
Transm it Attem pts
Transm it Packet
Receive ACK
Attem pts = 0
Decrem ent
Transm it
9