AC4790-200A-485 Laird Technologies, AC4790-200A-485 Datasheet - Page 33

• 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

R ea d D i g it a l I n p u t s
The OEM Host issues this command to read the state of both digital
input lines.
R ea d R a d io T ab l e
The OEM Host issues this command to read the Radio Table that
resides on the transceiver. The Radio Table stores information for up to
the last 8 transceivers that it received a packet from. This information
can be useful for determining alternative data paths.
Stale Count: The Stale Count Reload (0x04) determines the amount of
time that a transceiver stays active in the Radio Table. The Stale Count
(min: 0x00; max: dependent on EEPROM setting) for a radio is set to 0
when a packet is received; and then incremented by one every 100 ms
thereafter. When the Stale Count of a transceiver reaches the Stale
Count Reload (0x04), the transceiver is considered stale. A Radio Table
can hold information for up to 8 different transceivers; however if the
table is full and a ninth radio appears, the first stale radio is replaced
with the new radio. If none of the radios are stale, the oldest radio is
replaced by the new radio.
Signal Strength (dBm)
-36 to -22
-42 to -39
-12 to -6
-2 to 1
-46
-49
-52
-56
-59
4
T a b l e 1 1 : R e c e i v e d S i g n a l S t r e n g t h
RSSI Value (Hex)
0x0E
0x0D
0x0C
0x0B
0x0C
0x0D
0x0E
0x1C
0x11
0x17
www.lairdtech.com\wireless
Signal Strength
(dBm)
-62
-66
-69
-72
-76
-79
-82
-86
-89
-92
Command: 0xCC 0x20
Number of Bytes Returned: 2
Response: 0xCC Data1
Parameter Range: Data1 = bit-0: GI0, bit-1: GI1
Command: 0xCC 0x18
Number of Bytes Returned: Varies
Response: 0xCC #Transceivers MAC2 MAC1 MAC0 RSSI
RSSI* StaleCount MAC2 MAC1 MAC0...etc.
C O N F I G U R I N G T H E A C 4 7 9 0
RSSI Value (Hex)
0xAD
0xBD
0x2B
0x9A
0x40
0x55
0x62
0x71
0x78
0x84
2 9