User Manual

Global Transceiver Module (GXM) Wireless Data Transceiver User Manual
LUM0031AA
Version 1.0 32
(3) XMIT RATE
Two settings for the Transmit Rate parameter are available. The setting for normal operation of the
transceiver is a Transmit Rate 1. Transmit Rate 0 is useful to qualitatively gauge signal strength in Point
to Point mode. When set to Transmit Rate 0, the transceivers will transmit back and forth continuously,
even if no data is being applied to the serial port. A Transmit Rate setting of 0 should be used only as a
diagnostic tool and not for normal operation. The strength of the signal may be gauged by the Clear to
Send (CTS) LED. A solid red CTS LED indicates a strong signal; a blinking CTS LED indicates a weaker
signal.
(4)
RF DATA RATE
FreeWave transceivers have two settings for the RF Data Rate (2, 3). RF Data Rate should not be
confused with the serial port Baud Rate. Setting 2 (RF Speed of 153.6kbps) should be used when the
transceivers are close together and data throughput needs to be optimized. Setting 3 (RF Speed of
115.2kbps) should be used when the transceivers are farther away and a solid data link is preferred over
data throughput.
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.
(5)
RF XMIT POWER
The RF Xmit power setting controls the output power of the radio. This setting ranges from 0 dBm (1 mW)
to 27 dBm (500 mW). For certain purposes, the radio can be hard-coded to a maximum output power of
20 dBm (100 mW). This is an option that can be set at the factory. In these cases, the RF Xmit Power
setting cannot be set higher than 20.
Output power notes:
 The output power of the radio will be within 1 dBm of the setting, on average, at room
temperature.
 At a setting of 10 dBm specifically, the output power will be within 1.5 dBm of the setting.
 At settings lower than 10 dBm, the actual output power of the radio can vary further.
 At a setting of 20 dBm, the radio is calibrated to output exactly 20 dBm (100 mW) across the
entire operating temperature range of the radio.
(6)
SLAVE SECURITY
Slave security is a feature that allows Slave transceivers to accept transmissions from a Master not
included in the Call Book. The default setting is 0 (Slave Security enabled) which means, only a Master
which is in the Slaves’ Call Book may link to that Slave.
Slave Security may be disabled (setting of 1) allowing any Master to call the Slave. Slave Security has no
effect in Point-to-MultiPoint networks where the Network ID is not set to 255.
Slave Security must be set to 1 when the unit is operating in Mode 6 Slave/Master switchable or a Point-
to-Point network where the Slave may need to accept calls from more than 10 different Masters. When
Slave Security is set to 1, the transceiver will accept calls from any other FreeWave transceiver.
Additional network security measures may be taken to prevent unauthorized access, such as changing
default settings for FreqKey, Hop Table or Frequency Zones.
(7)
RTS TO CTS
The RTS to CTS setting in the Radio Parameters menu provides the option of allowing the RTS line on
the Master transceiver to control the CTS line of the Slave. This pass-through control can be enabled in
both Point-to-Point and Point-to-MultiPoint. In MultiPoint networks, the Master RTS line will control all
Slaves’ CTS lines. When enabled, the CTS line ceases to function as flow control. It is not recommended
to enable this feature when operating at RS-232 speeds above 38.4kB.
FreeWave T
echnologies, Inc.
1180 S Flatiron Ct Ste F
Boulder, CO 80501
[phone]