AeroComm Corporation AC4490 Benutzerhandbuch
www.aerocomm.com
S
OFTWARE
I
NTERFACE
5
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 and 0x30 - 0x37 hop on 26 different frequencies. Channels 0x10 - 0x2F
use 50 different frequencies.
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 and 0x30 - 0x37 hop on 26 different frequencies. Channels 0x10 - 0x2F
use 50 different frequencies.
Auto Channel - To allow for more flexible network configurations, Auto Channel can be enabled on Client transceivers
to allow them to automatically synchronize with the first Server they hear a beacon from, regardless of the Server’s
Channel Number or signal strength. Note: A Client with Auto Channel enabled will only synchronize with a Server
operating in the same Channel set and with the same System ID.
to allow them to automatically synchronize with the first Server they hear a beacon from, regardless of the Server’s
Channel Number or signal strength. Note: A Client with Auto Channel enabled will only synchronize with a Server
operating in the same Channel set and with the same System ID.
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.
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.
Sync to Channel - The AC4490 is a frequency hopping transceiver with a fixed hopping sequence. Without
synchronizing their frequency hopping, collocated systems on different channels can interfere with each other. To
avoid this, sync-to-channel can be used to synchronize the collocated Servers. A Server transceiver with sync-to-
channel enabled must have its Sync Channel set to another Server’s RF Channel number. It is required that a Server
with sync-to-channel enabled have its sync channel set to a value less than its RF Channel number. Collocated
networks using sync-to-channel must use the same channel set.
Note: If Server A (with sync-to-channel enabled) cannot synchronize to Server B (on the sync channel), Server A will
not be able to communicate with its Clients and must wait until it synchronizes with Server B (at which point In_Range
synchronizing their frequency hopping, collocated systems on different channels can interfere with each other. To
avoid this, sync-to-channel can be used to synchronize the collocated Servers. A Server transceiver with sync-to-
channel enabled must have its Sync Channel set to another Server’s RF Channel number. It is required that a Server
with sync-to-channel enabled have its sync channel set to a value less than its RF Channel number. Collocated
networks using sync-to-channel must use the same channel set.
Note: If Server A (with sync-to-channel enabled) cannot synchronize to Server B (on the sync channel), Server A will
not be able to communicate with its Clients and must wait until it synchronizes with Server B (at which point In_Range
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
Channel Set
1
1. All Channels in a Channel Set use the same frequencies in a different order.
RF Channel Number
Range (0x40)
Frequency Details &
Regulatory requirements
Countries
0 (AC4490 - 1x1
AC4490 - 200)
0x00 - 0x0F
902 - 928 MHz (26 hop bins)
US / Canada
1 (AC4490 - 1x1
AC4490 - 1000)
0x10 - 0x2F
902 - 928 MHz (50 hop bins)
US / Canada
2 (AC4490 - 1x1
AC4490 - 200
AC4490 - 1000)
0x30 - 0x37
915 - 928 MHz (22 hop bins)
US / Canada (-1x1 / -200)
Australia(-1x1/-200/-1000)