AC4490-1000M-485 Laird Technologies, AC4490-1000M-485 Datasheet - Page 34
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AC4490-1000M-485
Manufacturer Part Number
AC4490-1000M-485
Description
TXRX 900MHZ 3.3V TTL 1W
Manufacturer
Laird Technologies
Series
AeroCommr
Specifications of AC4490-1000M-485
Frequency
902MHz ~ 928MHz
Data Rate - Maximum
115.2kbps
Modulation Or Protocol
FHSS, FSK
Applications
AMR, Fire & Security Alarms, Telemetry
Power - Output
5mW ~ 1W
Sensitivity
-110dBm
Voltage - Supply
3.3V, 5V
Current - Transmitting
650mA
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
1000 mW
Antenna
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
2 8
C O N F I G U R I N G T H E A C 4 4 9 0
A T C O M M A N D S
The AT Command mode implemented in the AC4490 creates a virtual version of the Command/Data pin. The “Enter
AT Command Mode” Command asserts this virtual pin Low (to signify Command Mode) and the “Exit AT Command
Mode” Command asserts this virtual pin High (to signify Data). Once this pin has been asserted Low, all On-the-Fly
CC Commands documented in the manual are supported.
O n - t h e - F l y C o n t r o l C o m m a n d s
The AC4490 transceiver contains static memory that holds many of the parameters that control the transceiver
operation. Using the “CC” command set allows many of these parameters to be changed during system operation.
Because the memory these commands affect is static, when the transceiver is reset, these parameters will revert back
to the settings stored in the EEPROM. While in CC Command mode using pin 17 (Command/Data), the RF interface
of the transceiver is still active. Therefore, it can receive packets from remote transceivers while in CC Command
mode and forward these to the OEM Host.
The Command/Data RX Disable feature can be enabled in firmware versions 8.6+. When enabled in EEPROM, the
radio disables the RF receiver while pin 17 (Command/Data) is Low. To ensure that the radio is not in the middle of
transmitting data to the OEM Host, the host should be prepeared to receive data for up to 20 ms after taking pin 17
Low.
While in CC Command mode using AT Commands, the RF interface of the transceiver is active, but packets sent from
other transceivers will not be received. The transceiver uses Interface Timeout/RF Packet Size to determine when a
CC Command is complete. Therefore, there should be no delay between each character as it is sent from the OEM
Host to the transceiver or the transceiver will not recognize the command. If the OEM Host has sent a CC Command
to the transceiver and an RF packet is received by the transceiver, the transceiver will send the CC Command
response to the OEM Host before sending the packet. However, if an RF packet is received before the Interface
Timeout expires on a CC Command, the transceiver will send the packet to the OEM Host before sending the CC
Command response.
When an invalid command is sent, the radio scans the command to see if it has a valid command followed by bytes
not associated with the command, in which case the radio discards the invalid bytes and accepts the command. In all
other cases, the radio returns the first byte of the invalid command back to the user and discards the rest.
C O M M A N D / D A T A R X D I S A B L E
A T C O M M A N D M O D E