User's Manual

AC4490 Specifications
AC4490 SpecificationsAC4490 Specifications
AC4490 Specifications
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5.1.10
5.1.105.1.10
5.1.10 AD In and AD Out (pins 18 and 19 respectively)
AD In and AD Out (pins 18 and 19 respectively)AD In and AD Out (pins 18 and 19 respectively)
AD In and AD Out (pins 18 and 19 respectively)
When enabled in EEPROM, AD In and AD Out can be used as a cost savings to replace Analog-to-
Digital and Digital-to-Analog converter hardware. The following conditions are all possible when
enabled in EEPROM. Note: AD Out is an unbuffered, high impedance output and must be buffered
must be bufferedmust be buffered
must be buffered by
the OEM Host when used.
1) A refresh rate can be programmed in EEPROM to cause a transceiver to read the AD In port
and send the state of that port over the RF (as configured by RF Mode
RF ModeRF Mode
RF Mode) and will be presented
to the AD Out pin on the remote radio(s).
2) A “CC” command is issued to cause a transceiver to read the AD In port locally and send the
state of that port over the RF (as configured by RF Mode
RF ModeRF Mode
RF Mode) and will be presented to the AD Out
pin on the remote radio(s).
3) The
Read ADC
Read ADCRead ADC
Read ADC command is issued to read the state of AD In locally (details can be found in
the
On-the-Fly Control Command Reference
On-the-Fly Control Command ReferenceOn-the-Fly Control Command Reference
On-the-Fly Control Command Reference ).
4) The
Write ADC
Write ADCWrite ADC
Write ADC command is issued to write the AD Out pin to a particular state locally (details
can be found in the
On-the-Fly Control Command Reference
On-the-Fly Control Command ReferenceOn-the-Fly Control Command Reference
On-the-Fly Control Command Reference ).
6) A “CC” command is issued to write the AD Out pin on a remote radio(s) to a particular state.
This state is transmitted over the RF (as configured by RF Mode
RF ModeRF Mode
RF Mode) and will be presented to the
AD Out pin on the remote radio(s).
5.1.11
5.1.115.1.11
5.1.11 In Range (pin 20)
In Range (pin 20)In Range (pin 20)
In Range (pin 20)
The IN_RANGE pin at the connector will be driven logic Low when a Client is in range of a Server on
the same RF Channel
RF ChannelRF Channel
RF Channel and System ID
System IDSystem ID
System ID. If a Client cannot hear a Server for 7.5s, it will drive the
IN_RANGE pin logic High and enter a search mode looking for a Server. As soon as it detects a
Server, the IN_RANGE pin will be driven logic Low. A Server Host can determine which Clients are in
range by the Server’s Host software polling a Client’s Host.
5.2
5.25.2
5.2 S
SS
S
OFTWARE
OFTWARE OFTWARE
OFTWARE
P
PP
P
ARAMETERS
ARAMETERSARAMETERS
ARAMETERS
Below is a description of all software parameters used to control the AC4490.
5.2.1
5.2.15.2.1
5.2.1 RF Architecture (Unicast/Broadcast)
RF Architecture (Unicast/Broadcast)RF Architecture (Unicast/Broadcast)
RF Architecture (Unicast/Broadcast)
The Server controls the system timing by sending out regular beacons (transparent to the transceiver
Host) which contain system timing information. This timing information synchronizes the Client radios
to the Server.
Each network should consist of only one Server. There should never be two Servers on the same RF
RFRF
RF
Channel Number
Channel NumberChannel Number
Channel Number in the same coverage area, as the interference between the two Servers will severely
hinder RF communications.
The AC4490 runs a Peer-to-Peer type architecture where all transceivers, whether Servers or Clients,
can communicate with all other transceivers. To prohibit transceivers from receiving broadcast
packets, Unicast Only
Unicast OnlyUnicast Only
Unicast Only can be enabled.