Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL TMX/TMR RFL Electronics Inc.
January 25, 2012 21 (973)
334-3100
FUNCTIONAL DESCRIPTION
The IMUX 2000 Telemetry System consists of a Telemetry Transmitter (TMX) and a Telemetry
Receiver (TMR) and uses digital controls to set its operating parameters. A full range of parameters
can be set in remote mode using Network Management software, however, some selected parameter
values are available through DIP switches when operating in local mode. Each of the four analog
channels can have independent settings. A block diagram of the IMUX 2000 Telemetry System is
shown in Figure 5.
The analog input to the transmitter can originate either at the analog channel input port or at the
common calibration input. Each of the four analog channels can be connected to the calibration port
one at a time. The analog signal is passed through a gain stage to bring the signal as close to internal
full scale as possible. This allows taking full advantage of the A/D converter resolution. The internal
full scale is +/-10 volts nominal. After the signal is digitized by the A/D converter, an offset value is
subtracted from the resulting code. This is done to allow proper processing by the digital multiplier in
the receiver. The offset is used to bring unipolar signals to zero or to center bipolar signals around
zero.
In the receiver, the incoming data is fed into a digital multiplier where it is multiplied by the transfer
ratio. This allows arbitrary and almost continuous adjustment to the input-to-output gain in the system.
The input and output gain stages each have four discrete values. Following the digital multiplier, an
output offset value is added to the data which is then fed to the D/A converter. The internal full scale
current is +/- 50 mA nominal. Finally, the analog signal is passed to an output gain stage before
appearing at the output port.
Alerts/Alarms
The RFL TMR module reports three types of ALERTS to the shelf Common Module:
1. Loss of telemetry frame synchronization
2. Non-matching TMX/TMR addresses
3. TPU alert (loss of communication)
Any one of these alerts causes the digital controller on the TMR module to drive the relay on the MA-
700 module adapter.
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