AC4490 User Guide
Version 4.5
Laird Connectivity Solutions Support Center:
http://ews-support.lairdtech.com
27
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
RF Channel Number
A number that designates an independent network of AC4490 units. Up to 32
independent networks can be created.
Note: The valid range of values for this field is 16 to 47.
Sync to Channel
Sync-to-channel can be used to synchronize server frequency hopping and prevent
interference between collocated systems. A server transceiver with Sync-to-Channel
enabled must have its Sync Channel set to another server’s RF Channel number. A
server with Sync-to-Channel enabled must set its sync channel to a value less than its
RF Channel number. Collocated networks using Sync-to-Channel must use the same
channel set and system ID.
Note: Sync-to-Channel Radio Feature must be enabled.
If server A (with sync-to-channel enabled) can’t sync to server B (on the sync channel),
server A will be unable to communicate with its clients. It must wait until it syncs with
server B (at which point In_Range is asserted), before establishing communications.
Server B will not be affected and can communicate with its clients.
See
for further details and sample configuration.
Max Power
Max Power provides a means for controlling the RF output power of the AC4490.
Output power and current consumption can vary by as much as ±10% per
transceiver for a particular Max Power setting. Contact Laird for assistance in
adjusting Max Power.
Note: The max power is set during Production and may vary slightly from one
transceiver to another. The max power can be set as low as desired but
should not be set higher than the original factory setting. A backup of the
original power setting is stored in EEPROM address 0x8E.
Output Power
Table 6: AC4490-200
EEPROM Value (Hex)
Current (mA)
dBm
mW
0
61
-22
0.01
1
64
-9
0.13
2
65
-3
0.5
3
66
1
1.26
4
67.5
4
2.51
5
70
7
5.01
6
73
9
7.94
7
77
10.5
11.22
8
83
12
15.85
9
88
13.5
22.39
A
93.5
14.5
28.18
B
99
15.5
35.48
C
105
16.5
44.67
D
110.5
17
50.12
E
114.5
17.5
56.23
F
117.5
18.5
70.79
1E
126
19.5
89.13
60
127.5
20
100
Table 7: AC4490-1000
EEPROM Value (Hex)
Current (mA)
dBm
mW
0
430
-1
0.79
1
430
9
7.94
