Spread Spectrum Wireless Data Transceiver User Manual
LUM0002AG Rev D
Version 7.0
43
Note:
If ‘DTRConnect’ is set to 1 and the ‘RTS to CTS’ function is enabled on the radio, then ‘RTS to
CTS’ takes precedence over ‘DTRConnect’.
Note:
If ‘DTRConnect’ is set to ‘2’ and ‘RTS to CTS’ is enabled, then ‘RTS to CTS’ is ignored. The
transceiver has two separate transmit and receive user data buffers. For the FGR series radios,
these buffers are 2 Kbytes each. In case of a buffer overflow, the transceiver will output
unpredictable data.
(5)
R
EPEATER
F
REQUENCY
Repeater Frequency must be set to a 1 in a Repeater when a FreqKey other than that of the Master is
desired. This condition occurs when parallel Repeaters in a network may have overlapping areas of
responsibility. The default setting of 0 causes the Repeater to use the FreqKey set in Menu 3.
Note:
When Repeater Frequency is set to 0 and Subnets are not configured, the FreqKey setting in
each Slave must match the Master or Repeater acting as the Master for the transceiver.
(6)
N
ETWORK
ID
NetWork ID allows MultiPoint networks to be established without using the Call Book. The default setting
of 255 enables the Call Book. To enable NetWork ID the value must be set between 0 and 4095
(excluding 255). Since NetWork ID does not use serial numbers, MultiPoint Masters and Repeaters may
be replaced without reprogramming all of the Slaves in the network. Slaves will link with the first Master
or Repeater that it hears that has a matching NetWork ID. The Network ID function should be used in
conjunction with the SubNet ID feature (If necessary).
Without having the serial numbers in the Call Book, a Slave may establish communications with different
Masters, though not at the same time. This is very useful in mobile MultiPoint applications.
(8)
M
ULTI
M
ASTER
S
YNCH
MultiMaster Synch is reserved for applications, in both Point-to-Point and MultiPoint modes, with
concentrations of Master units where it is necessary to reduce interference between the Masters. Please
see application note #5412 Synchronizing Collocated Masters or contact FreeWave Technical support for
more information.
(9)
1
PPS
E
NABLE
/D
ELAY
The 1 PPS Enable/Delay option allows the radio network to propagate a 1PPS signal from the Master to
all Slaves in a MultiPoint network. When this parameter is enabled a properly generated pulse applied on
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