
68
8. Problem solving
8.1. LED signaling
LED indicators placed on
MT-021
panel are a great diagnostic tool.
In table below are described all states signaled by LED diodes.
LED
Signaling
Description
PWR
on
Module powered V+ and GND terminals
USB
on
USB connected - module powered from USB
I1...I4
on Input
activated
off Input
deactivated
Q1...Q4
on Output
activated
off Output
deactivated
GSM
blinking quickly Module initialization
1 blink
Modem initialization
2 blinks
GSM network searching
3 blinks
Module logged in GSM network
1 long i 3 short
blinks
Module logged in GPRS network
SGN
1-4 blinks
GSM signal strength
ACT Tx
on Sending
SMS
blinking Outgoing
call
ACT Rx
on Receiving
SMS
blinking Incoming
call
ERR
blinking quickly Updating module firmware
1 blink
Unsuccessful SMS sending attempt
2 blinks
No SIM card or SIM card improperly inserted
3 blinks
Wrong PIN
4 blinks
Wrong PIN. No more PIN entering attempts or PUK needed.
5 blinks
Unsuccessful GSM log in attempt
Содержание MT-021
Страница 1: ......
Страница 9: ...6 ...
Страница 11: ...8 3 2 Power supply MT 021 may be powered by 9 30 V DC ...
Страница 18: ...15 ...
Страница 29: ...26 Pt 100 2 wire AN1 only Pt 100 3 wire AN1 only NTC AN2 only Voltage output sensor ...
Страница 70: ...67 7 7 Drawings and dimensions All dimensions in millimeters ...