User's Manual
Table Of Contents
- FreeWave Technologies
- LRS-455-EU
- Data Transceiver
- Version 1.0, Revision A
- About FreeWave Transceivers
- Choosing a Location for the Transceivers
- Quick Start on a Point-to-Point Network
- Setting up a Transceiver
- Operation Mode
- Baud Rate
- Modbus RTU Timing
- The Modbus RTU setting causes the radio to wait for an amount of time, “gathering” data before sending out the radio link.
- With a setting of 0 (Disabled), the radio will send data out its radio link as soon as the data is received into the serial port.
- With a setting of 1, the radio will wait for a number of slots equal to 2 times the Master Packet Repeat setting before sending the received data out the radio link. For example, if Master Packet Repeat = 3, the radio will wait for 6 slots, gathering ...
- With a setting of 2 and higher, the radio will wait for a number of slots calculated by the following formula:
- (Modbus RTU Setting + Master Packet Repeat Setting + 1) x 2
- For example, in a radio where the Modbus RTU setting = 2 and the Master Packet Repeat setting = 3, the radio will wait for (2+3+1) x 2, or 12 slots.
- Call Book
- Radio Transmission Characteristics
- Edit Radio Transmission Characteristics
- MultiPoint Parameters
- Edit MultiPoint Parameters
- Radio Information
- Operational RS-422 and RS-485 Information
- RS232 Pin Assignments
- RF Board Pinout
- FreeWave Technical Support
- Errata
LRS-455-EU Data Transceiver Users Manual
LUM0032AA Rev A Version 1.0 13
The following 3 tables provide the information to determine optimum setting values.
Minimum Packet Size Definition
Min Setting Min Packet Size
0
0
1
16
2
32
3
48
4
64
5
80
6
96
7
112
8
128
9
144
Maximum Packet Size (2 level FSK)
Max Setting Max Packet Size
0
32
1
48
2
64
3
80
4
96
5
112
6
128
7
135
8
135
9
135
(3)
XMIT RATE
FreeWave transceivers utilize a Master Transmit Beacon to provide low current consumption in the slave
radios. The slave radios will turn their receiver off when no data is being passed.
The Xmit Rate setting allows the duty cycle of the Master Transmit Beacon to be changed. A setting of 0
is the highest duty cycle and a setting of 9 is the lowest duty cycle.
(4)
RF DATA RATE
The RF Data Rate controls the data rate used for over-the-air communication and should not be confused
with the serial port Baud Rate. Currently, the only supported RF Data Rate is 5.
Note: In MultiPoint networks, the RF Data Rate must be set identically in all transceivers. Any
transceiver with an RF Data Rate different from the Master will not establish a link.
In Point-to-Point networks the Master’s settings take precedence over the Slave.
RF Data Rate Setting
Occupied Bandwidth
Modulation Level
5
12.5kHz
2-level GFSK