User Manual

MXi AMPLIFIER CONTROLLER BOARD REV.2
PUB06-82 Rev 1 July 17, 2007 06-82-35 MXi Amplifier Controller Board Rev.2
5.2.1 Status Outputs
Figure 22 Status Outputs
These are current sinking open collector outputs, out of quad pack MPQ2222 (2N2222A) NPN transistors driven
by opto-isolator devices. The available output sink current is dependent on the gain of the NPN and the opto-
isolator transfer ratio. Generally, one can expect at least 100mA of sinking current for each output listed here.
Because these are open collector, they can be used in special applications, such as on-site warning signal
activation if desired, but they are limited in external circuit voltage to maximum 60VDC. Each status (in
parentheses) indicates what it means when in its active low condition.
The MXi provides three remote control outputs that represent the current operating state of the switching system
via the Digital Output Board
TX D-Connector PC Board Connector Designation Description
Remote Control
Pin 9 J6 Pin 2 RS TXOn Transmitter is turned ON
Pin 2 J6 Pin 3 RS_Error Transmitter has an error
Pin 10 J6 Pin 4 RS_Remote
Transmitter is in Remote
Mode
Pin 12 J6 Pin 8 Ground Ground Reference
5.3 TELEMETRY OUTPUTS
These are buffered OpAmp outputs, out of quad pack LM324 operational amplifiers. The available output voltage
is limited to the range of 0 – 5VDC. The OpAmp can reliably source around 5mA of current and so a relatively
high impedance input of at least 2K ohms should be used. Each telemetry has a description to indicate what
parameter it is measuring.
The MXi provides five remote telemetry outputs that represent the current operating levels of the MXi transmitter.