AC4490LR-200M Laird Technologies, AC4490LR-200M Datasheet - Page 63

• Manufacturer Part Number: AC4490LR-200M
• Description: TXRX 900MHZ 3.3-5.5V TTL 200MW
• Manufacturer: Laird Technologies
• Series: AeroCommr

Specifications of AC4490LR-200M

• 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
• Output Power: 200 mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Current - Receiving: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A P P E N D I X I I I - A P I
5 7
AC4490 User’s Manual
E n h a n c e d R e c e i v e A P I
When Enhanced Receive API is enabled, the transceiver will receive the reply data + the MAC address of the source
radio and one RSSI value; RSSI* is how strong the local heard the remote transceiver.
It may be useful to the OEM Host to determine which radio each packet originated from. When Enhanced Receive API
is enabled, every packet received by the transceiver will be received in the above format.
N o r m a l R e c e i v e M o d e ( n o n - A P I )
If Receive API is not enabled, the transceiver will receive the reply data only (i.e. “ALLGOOD”) from each transceiver.
L O O P B A C K R E P E A T E R
The simplest repeater to implement is a loopback repeater. A loopback repeater can be created by connecting the
transceiver’s RXD and TXD lines together. When the radio receives data, it will retransmit the data to all available
transceivers on the network. It is important not to have two loopback repeaters in range of each other as they will
continuously transmit data back and forth.
A
B
C
MAC 12 34 56
MAC 12 34 A1
MAC 12 34 A2
MAC 12 34 A3
Loopback Repeater
If radios B & C in the above picture are not within range of radio A, they will not be able to receive or respond to
communications from radio A. A loopback repeater can be added between the three such that it is in range of both
radio A and radios B & C. When the repeater receives a packet from radio A, it will transmit the packet out to radios B
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