Led indicators – Hanna Instruments HI 504901 User Manual

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SMS ENABLE/DISABLE LEDs

These two LEDs keep indication about SMS sending enable/
disable status and are used on fault interface related condition
to provide to the user a “visual” indication of actual problem.
• green LED on & red LED off, in idle state: SMS sending

enabled

• green LED off & red LED on during interface start-up

procedure or in idle state if SMS sending is disabled

• green LED blinking & red LED off, in power failure

status: SMS sending enabled

• green LED off & red LED blinking, in power failure

status: SMS sending disabled

• green LED blinking & red LED on, battery test failed

and SMS sending enabled

• green LED on & red LED blinking, battery test failed

and SMS sending disabled

• green & red LEDs blinking, cellular error is active
• green & red LEDs on, EEPROM data corruption

DIGITAL OUTPUT STATUS LED

This yellow LED keeps indication about digital output contact
status (if software enabled).
• LED off, digital output contact open
• LED on, digital output contact close

CELLULAR SIGNAL LEDs

These green LEDs keep indication about signal strength for
cellular phone module.
• Cell signal #1 & Cell signal #2 LEDs off, no signal

or cellular error found or power failure status

• Cell signal #1 LED on & Cell signal #2 LED off,

medium signal condition

• Cell signal #1 & Cell signal #2 LEDs on, strong

signal condition

CELLULAR STATUS LED

When available, this yellow LED displays the operating status
of the cellular phone terminal.
• LED off, cellular engine off
• LED on, cellular engine on but not registered to the network
• LED blinking (slow), cellular engine on and registered to

the network

• LED blinking (fast), cellular engine registered to the net-

work and a call is in progress

LED INDICATORS

Find here below a brief explanation of all possible LEDs indi-
cations of HI504901 interface.

RS232 CHANNEL# LED

This red LED keeps indication about device connected to the
RS232 channel#.
• LED off

• in idle state: instrument not configured or not in alarm
• during PC communication session: a communication is

in progress with another channel or not yet channel selec-
tion made by remote PC

• LED on, in idle state: instrument configured and in alarm
• LED blinking, during PC communication session: a com-

munication is in progress between remote PC and device
connected to this RS232 channel

RS485 PORT LED

This red LED keeps indication about devices connected to the
RS485 port.
• LED off

• in idle state: no instrument is configured or no alarm is on
• during PC communication session: a communication is

in progress with another channel or not yet channel selec-
tion made by remote PC

• LED on, in idle state: at least one instrument is configured

and at least one alarm is on

• LED blinking, during PC communication session: a com-

munication is in progress between remote PC and one of
RS485 instruments

DIGITAL INPUT PORT LED

This red LED keeps indication about digital input status (if soft-
ware enabled) depending on last interface configuration setting.
• LED off

• in idle state: digital input not configured or digital contact

close (if configured to be on when contact is open) or
contact open (if configured to be on when contact is close)

• during PC communication session: when a call is in

progress with any instrument

• LED on, in idle state: digital input configured and close (if

configured to be on when contact is close) or contact open (if
configured to be on when contact is open)