AC4790-200A-485 Laird Technologies, AC4790-200A-485 Datasheet - Page 23

• Manufacturer Part Number: AC4790-200A-485
• Description: TXRX 900MHZ 3.3-5.5V FHSS 200MW
• Manufacturer: Laird Technologies
• Series: AeroCommr

Specifications of AC4790-200A-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: On-Board, Chip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Wireless Frequency: 900 MHz
• Interface Type: 20-pin mini connector
• Board Size: 49 mm x 42 mm x 5 mm
• 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

N E T W O R K I N G
System ID - System ID (EEPROM address 0x76) is similar to a password character or network number and makes
network eavesdropping more difficult. A transceiver will not establish a Session or communicate with a transceiver
operating on a different System ID or Channel Number.
RF Channel Number - Channels 0x00 - 0x0F hop on 26 different frequencies. Channels 0x10 - 0x2F use 50 different
frequencies. Channels 0x30 - 0x37 hop on 22 different frequencies and are only available for use in Australia.
DES (Data Encryption Standard) - DES (Data Encryption Standard) – Encryption is the process of encoding an
information bit stream to secure the data content. The DES algorithm is a common, simple and well-established
encryption routine. An encryption key of 56 bits is used to encrypt the packet. The receiver must use the exact same
key to decrypt the packet; otherwise garbled data will be produced.
To enable DES, EEPROM Byte 0x45, bit 6 must be set to a value of 1. To disable DES, set bit 6 to a value of 0. The 7
byte (56 bits) Encryption/Decryption Key is located in EEPROM Bytes 0xD0 – 0xD6. It is highly recommended that this
Key be changed from the default.
E N G I N E E R ’ S T I P
What effects will Random Backoff have on system latency?
As the random backoff value increases, the overall system latency increases.
Worst case latency (Half Duplex) = 50 ms * Number of retries * Max. random value
Worst case latency (Full Duplex) = 100 ms * Number of retries * Max. random value
1. All Channels in a Channel Set use the same frequencies in a different order.
Channel Set
0 (AC4790 - 1x1
1 (AC4790 - 1x1
2 (AC4790 - 1x1
AC4790 - 1000)
AC4790 - 1000)
AC4790 - 200
AC4790 - 200)
1
T a b l e 9 : R F C h a n n e l N u m b e r S e t t i n g s
Number Range
RF Channel
0x00 - 0x0F
0x10 - 0x2F
0x30 - 0x37
(0x40)
www.lairdtech.com\wireless
Regulatory requirements
902 - 928 MHz (26 hop bins)
902 - 928 MHz (50 hop bins)
915 - 928 MHz (22 hop bins)
Frequency Details &
Australia(-1x1/-200/-1000)
US / Canada
US / Canada
Countries
S E R I A L I N T E R F A C E
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