LRS400S Data Transceiver Users Manual
LUM0025AA Rev A
Version 1.0
24
the DTR line of the Master will provide a 1 PPS pulse on the CD line of any Slave in the network. To use
the 1 PPS Enable/Delay feature the steps outlined below must be followed:
1PPS Enable/Delay Setup:
1.
The 1 PPS Enable/Delay parameter must be set to 0 in the Master.
2.
The Master must have a 1 PPS pulse on the DTR pin.
3.
The 1 PPS Enable/Delay parameter on the Slaves must be enabled. Slaves are calibrated at the
factory.
Calibrating a Slave in 1PPS Enable/Delay mode
1.
Trigger an oscilloscope on the 1 PPS pulse on the DTR line of the Master.
2.
Monitor the CD line of the Slave.
3.
If the timing on the Slave differs from the Master it may be adjusted via the value in the Slave's 1
PPS Enable/Delay parameter. The difference in time between each incremental integer value is
542.534nS. Changing the parameter to higher values decreases the Slave time delay and
changing the parameter to lower values increases the time delay.
When properly calibrated the CD line of a Slave radio will output a pulse that goes high for about 2mS in
sync with the 1 PPS pulse on the Master radio. The output on the Slave will occur within 20
microseconds of the input to the Master.
Note:
When 1 PPS is enabled, the Master
must
have a 1 PPS pulse on its DTR pin, otherwise the RF
network will not function.
(A)
S
LAVE
/R
EPEATER
Normally a repeater does not have the ability to provide data on the data port. When this capability is
necessary Slave/Repeater should be set to On. When using Slave/Repeater, the baud rate and
communication protocol must match the end device.
(B)
D
IAGNOSTICS
This option provides diagnostics data to be viewed at the Master in parallel with application data. The
diagnostic program MUST be run from the Master transceiver. Diagnostics requires the following:
1.
Diagnostics set to (1 to 128) in the Master.
2.
A second computer or serial connection to run the diagnostics software.
3.
A diagnostics cable. (Available from FreeWave Technologies.)
4.
Diagnostics software. (Available on the User Manual and System Tools CD.)
For more information on Diagnostics, please contact FreeWave Technical Support at (303) 381-9200.
(C)
S
UBNET
ID
The Subnet ID function only works in MultiPoint Networks utilizing the Network ID option. In a MultiPoint
Network, a Slave or Repeater will connect with the first Repeater or Master that it hears with the same
Network ID. However, where communications need to be forced to follow a specific path the Subnet ID is
quite useful. Subnet ID is particularly helpful to force two Repeaters in the same network to operate in series
rather than in parallel, or if desired, to force Slaves to communicate to a specific Repeater for load balancing
purposes. Two components exist with regard to the Subnet ID:
1.
Rcv Subnet ID. This setting identifies which transceiver a Repeater or Slave will listen to.
