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Description
Controls and Indicators
The push-button is used to activate the LED panel, to toggle the LED panel so that it displays
the status of the CPU or of the I/Os, to initiate software downloading to the CPU, and to erase
User Flash memory and RAM.
LED Control
Display On/Advance
When the display is off, pressing the push-button once, momentarily, activates the display.
Every consecutive momentary depression of the push-button advances the display to the next
page, in the following order: CPU > IO1 (I/O Page 1-DI) > IO2 (I/O Page 2-DO) > IO3
(I/O Page 3-DO) > Page 4 (User Application Controlled). The next depression of the push-
button returns the display to the CPU.
Display Off
The display can be programmed using the STS site configuration to turn off automatically after
a predefined period of time if the push-button has not been pressed.
LED Test
When the push-button is pressed continuously for a few seconds, all LEDs light up
simultaneously. When the push-button is released, the LEDs turn off.
User Flash Erase
After power-up, all LEDs light up. To erase the User Flash, press the push-button while the
LEDs are lit. All the LEDs flash three times. Now, release the push-button.
Alternatively, press the push-button continuously for at least 40 seconds at any time to erase
the User Flash.
System Software Downloading
During power up, press the push-button continuously. This will cause the unit to enter
bootstrap downloading mode, in which the FLASH is programmed from a PC connected to
Port 1 of the IRRInet-M. The CPU LED will begin to blink at 1 Hz, indicating that the CPU
has entered bootstrap downloading mode. If after 120 seconds no bootstrap software is loaded
and executed, the normal power-up procedure is performed.
CPU Reset (Cold Restart)/Power Off
To reset the CPU, turn the power supply to the unit off and on again. When the power supply
is turned off, all data stored in RAM will be erased ("cold restart").
CPU Fail
When a serious failure is found during the initialization of the unit, LED 3, the ERR LED, will
blink (CPU LED OFF) and LEDs in columns 3 and 4 will contain the error code indicating the
CPU error. See the list of errors below and the LEDs which will light.
4
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