ETS-Lindgren FM5004 Field Monitor (Archived) - Manual (Page 14)

Following are other commands performed by the probes; depending on the
specific probe, additional commands may be available.
• Zero
• Switch range
• Enable/disable axis
• Send temperature/battery voltage
When a probe receives a command from the I/O card it performs the requested
function and sends a response back to the FM5004.
R ECEIVER T HEORY
The FM5004 issues commands to the I/O cards, then the I/O card issues control
signals to the probe processor. It also receives the data from the probe, formats
it, and relays it to the FM5004 main processor.
The sampling rate, range settings, autorange enable/disable, display format, and
other setup parameters are stored in Electrically Erasable Programmable
Read-Only Memory (EEPROM). The setups are automatically restored each time
the FM5004 is powered on. Flash EEPROM memory is used to store the main
program. Random Access Memory (RAM) is used to temporarily store
measurements and settings.
Inputs to the FM5004 come from the keypad switches on the front panel or from
a remote control device connected through the IEEE-488 or RS-232 ports.
Information from the probes is communicated through the front panel LEDs and
display. Optional receiver outputs include:
• Output to a remote receiver through the IEEE-488 or RS-232 ports
• Analog output (with 12-bit resolution) to recorders or leveling circuitry
• Programmable alarm values for driving a relay that controls a remote
alarm
The FM5004 power supply operates from a 115–230 VAC power source. The
supply provides outputs of +5 VDC, -12 VDC, and +12 VDC.
14 | Introduction
Archived 10/19/10