AC4486-5M Laird Technologies, AC4486-5M Datasheet - Page 11

• Manufacturer Part Number: AC4486-5M
• Description: TXRX 868MHZ 3V TTL 5MW RS232
• Manufacturer: Laird Technologies
• Series: AeroCommr

Specifications of AC4486-5M

• Frequency: 868MHz
• Data Rate - Maximum: 115.2kbps
• Modulation Or Protocol: FSK
• Applications: AMR, Gaming Devices, Inventory Tracking
• Power - Output: 5mW
• Sensitivity: -100dBm
• Voltage - Supply: 3.3V
• Current - Receiving: 30mA
• Current - Transmitting: 40mA
• Data Interface: Connector, 2 x 10 Header
• Antenna Connector: MMCX
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Board Size: 49 mm x 42 mm x 5 mm
• Output Power: 5 mW
• Antenna: External MMCX Connector
• Frequency Rf: 869.65MHz
• Transmit Power: 5mW
• Interface Type: Serial
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AC4486 Specifications
3.3 S
Care should be taken when selecting transceiver architecture as it can have serious effects on data
rates, latency timings, and overall system throughput. The importance of these three characteristics
will vary from system to system and should be a strong consideration when designing the system.
3.3.1 Serial Interface Data Rate
The Serial Interface Data Rate is programmable by the Host. This is the rate the Host and transceiver
communicate over the serial bus. Possible values range from 1200 bps to 115,200 bps. Note:
Enabling Parity Mode cuts throughput in half and the Interface Buffer size in half. The following
asynchronous serial data formats are supported:
3.3.2 Latency
Note about Timing: The AC4486 is a single frequency radio design. Though it does not hop from one
frequency to another, packet delivery timing is based on a fictitious hop, which occurs every 20ms.
This maximizes the use of the AC4486 resources and makes timing much more deterministic. For
ease of understanding, the documentation will still refer to a hop. The Server will still send a timing
beacon out every 1.2s to provide Clients with its MAC Address.
Acknowledge Mode
The transceiver will use Interface Timeout in conjunction with Fixed Packet Length (whichever
condition occurs first) to determine a complete packet to be sent over the RF. If Full Duplex is
enabled, the transceiver must wait for its appropriate hop (even numbered hops for the Server and
odd numbered hops for the Client). Upon doing this, the transceiver will calculate the amount of time
until the next hop to ensure that it has time to send the packet. If there is enough time, it will send the
packet: if not, it will wait until its next appropriate hop. Transmit Retries and Broadcast Attempts are
handled in the same manner.
Stream Mode
The transceiver will use Interface Timeout in conjunction with Fixed Packet Length (whichever
condition occurs first) to determine a complete packet to be sent over the RF. Next, the transceiver will
begin sending the packet. If a hop is scheduled to occur before the entire packet can be sent out, the
01/21/05
YSTEM
Data Bits
9
8
8
8
7
7
7
T
IMING AND LATENCY
E,O,M,S
E,O,M,S
E,O,M,S
Parity
N
N
N
N
Table 5 – Supported Serial Formats
Stop Bits
1
1
2
1
2
2
1
Transceiver Programming Requirements
Parity Mode disabled
Parity mode disabled
Parity Mode disabled
Parity Mode enabled
Parity Mode enabled
Parity Mode enabled
Parity Mode enabled
11