TRP1000-4450 Troposcatter C-Band Outdoor Amplifier
Revision 0
Serial-based Remote Product Management
5–2
MN-TRP1000-OD
5.2.1
Faults
The M&C system monitors certain key functions of the TRP1000-4450 for proper operation. Should any of these parameters exceed
predetermined limits, the M&C system will declare a fault. The conditions that trigger a fault are:
•
Any power supply that is outside its nominal value.
•
Fan running less than 25% of maximum speed.
•
I2C internal bus communications fault.
Thermal Shutdown – A temperature fault is indicated if the unit is greater than +90
°
C. This creates a summary fault and will cause the unit
to mute itself and switch to the back-up unit (if in a redundant system). However, the 10V supply to the FET transistors will remain on until
the unit reaches the thermal shutdown temperature of +95
°
C or greater. For protection reasons, the unit will shut down the 10V supply to
the power transistors at temperatures greater than +95
°
C.
5.2.2
Some Common Commands
A few of the most common commands and queries are:
•
RMS – R
etrieve
M
aintenance
S
tatus. Displays voltages, fan speeds, Heatsink temperature, output power monitor reading, etc.
•
RCS – R
etrieve
C
onfiguration
S
tatus. Displays current attenuation, mute, amplifier, online, etc. status.
•
RAS – R
etrieve
A
larm
S
tatus. Displays current alarm or fault status.
Full details for each of these are listed in
Section 5.4
of this chapter.
5.3
Remote Control Protocol and Structure
For legacy serial communication, the electrical interface is either a full-duplex EIA-485/EIA-422 multi-drop bus (for the control of many
devices) or an EIA-232 connection (for the control of a single device), and data is transmitted in asynchronous serial form, using ASCII
characters. Control and status information is transmitted in packets, of variable length, in accordance with the structure and protocol
defined in later sections.
Additionally, the TRP1000-4450 also supports the serial command protocol over a Telnet session through the use of a 10/100Base-T
Ethernet connection with the TRP1000-4450. The Ethernet communications interface also supports SNMP protocol, and provides a
graphical user interface (GUI) through web pages that can be accessed using a web browser.
