AC4486-5M Laird Technologies, AC4486-5M Datasheet - Page 43

• 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
Stream Mode
In Broadcast Stream mode, the RF packet is broadcast out to all eligible receivers on the network. In
Addressed Stream Mode, the RF packet is sent out to the receiver designated by the Destination
Address. The sending transceiver will send each RF packet out once. There are no retries on the
packet. Whether or not the packet contains errors, the receiver(s) will send the packet to the OEM
Host. In fact, if only part of the packet is able to be received, the transceiver will still send the partial
packet to the OEM Host. Note: Stream Mode is incompatible with Full Duplex Mode.
5.2.3 Sub Hop Adjust
Sub Hop Adjust is an AC4486 protocol parameter and should only be modified at the recommendation
of Aerocomm.
5.2.4 Duplex Mode
In Half Duplex mode, the AC4486 will send a packet out over the RF when it can. This can cause
packets sent at the same time by a Server and a Client to collide with each other over the RF. To
prevent this, Full Duplex Mode can be enabled. This mode restricts Clients to transmitting on odd
numbered frequency “bins” and the Server to transmitting on even frequency bins. Though the RF
hardware is still technically half duplex, it makes the transceiver seem full duplex. This can cause
overall throughputs to be cut in half. Note: All transceivers on the same network must have the same
setting for Full Duplex. Full Duplex mode is incompatible with Stream RF mode.
5.2.5 Interface Timeout/RF Packet Size
Interface Timeout, in conjunction with RF Packet Size, determines when a buffer of data will be sent out
over the RF as a complete RF packet based on whichever condition occurs first.
Interface Timeout – Interface Timeout specifies a maximum byte gap between consecutive bytes.
When that byte gap is exceeded, the bytes in the transmit buffer are sent out over the RF as a
complete packet. Interface timeout is adjustable in 0.5ms increments and has a tolerance of ±0.5ms.
Therefore, the Interface Timeout should be set to a minimum of 2. The default value for Interface
Timeout is 4 or 2ms.
RF Packet Size – When the amount of bytes in the transceiver transmit buffer equals RF Packet Size,
those bytes are sent out as a complete RF packet. Every packet the transceiver sends over the RF
contains extra header bytes not counted in the RF Packet Size. Therefore, it is much more efficient to
send a few large packets than to send many short packets. However, if RF Packet size is set too large
and Acknowledge Mode is enabled, the transceiver will not be able to send any packets because
Acknowledge Mode requires the entire RF packet to be sent in the same hop whereas Stream Mode
packets can span multiple hops.
01/21/05
43