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 4
Quick Start on a Point-to-Point Network
When purchased as a pair, the FreeWave® Wireless Data Transceivers are shipped from the factory pre-
configured to operate in Point-to-Point applications. To establish communications between a pair of
FreeWave Wireless Data Transceivers just received from the factory:
1. Connect antennas to the transceivers. Freewave Technologies recommends that the antenna
port be loaded at all times to prevent damage to the LRS-455-EU radios. Noise potential may be
reduced on the bench by lowering the Xmit power.
2. Connect the transceiver to the instrument with the RS232 cable, connect the antenna port to a
load, and also attach power. The cable supplied with enclosed transceivers (except Waterproof)
is a 9-pin male serial; professional board level transceivers will need a separate programming
cable (sold separately).
3. Set the Modem mode in each transceiver. One should be set as a Point-to-Point Master (Mode
0) and the other set as a Point-to-Point Slave (Mode 1).
4. Set the baud rate on each transceiver to match the baud rate of the instrument to which it is
attached. Please note, when setting the transceiver's baud rate, its RS232 data rate is set. The
baud rate does not have to be on the same setting for the two transceivers.
5. Edit the Call Book. Enter the Slave serial number in the Master’s Call Book. Enter the Master’s
Serial number in the Slave’s Call Book, or disable Slave Security (in the Slave).
6. Shortly after both transceivers are plugged in, they should establish a communications link with
each other and the connection is complete. Using the table below, verify that the radios are
operating as expected.
Point-to-Point Operation LEDs
Master Slave
Condition
Carrier
Detect
(CD)
Transmit
(TX)
Clear to
Send (CTS)
Carrier
Detect (CD)
Transmit
(TX)
Clear to
Send (CTS)
Powered, no link
Solid red
bright
Solid red
bright
Solid red
bright
Solid red
bright
Off
Blinking red
Linked, sending
sparse data
Solid
green
Intermittent
flash
redo
Intermittent
flash
redo
Solid
green
Intermittent
flash
redo
Intermittent
flash
redo
Master calling
Slave
Solid red
bright
Solid red
dim
Solid red
bright
Solid red
bright
Off Blinking red
Mode 6 - waiting
for ATD command
Solid red
bright
Off
Blinking
red
Solid red
bright
Off Blinking red
Setup Mode
Solid
green
Solid
green
Solid green
Solid
green
Solid
green
Solid
green