7
2.3 Serial & IO & Power Pinouts
*: Only for -485 model.
2.4 LED Indicators
LED
Indication
Status
Description
POWER
Power Status
Off
The power is switched off
On
The power is switched on
SYSTEM
System Status
Green Light
Static: Start-up
Blinking slowly: the system is running properly
Red Light
The system goes wrong
SIM
SIM Card Status
Off
SIM1 or SIM2 is registering or fails to register (or there
are no SIM cards inserted)
Green Light
Blinking slowly: SIM1 has been registered and is ready
for dial-up
Blinking rapidly: SIM1 has been registered and is
dialing up now
Static: SIM1 has been registered and dialed up
successfully
Orange
Light
Blinking slowly: SIM2 has been registered and is ready
for dial-up
Blinking rapidly: SIM2 has been registered and is
dialing up now
Static: SIM2 has been registered and dialed up
successfully
Signal
Strength
Signal 1/2/3
Off
No signal
Green Light
Static/Off/Off: weak signals with 1-10 ASU (please
check if the antenna is installed correctly, or move the
PIN
RS232
/RS485*
DI
DO
Description
1
---
---
OUT
Digital Output
2
---
IN
---
Digital Input
3
GND
GND
---
Ground
4
---
COM
Common Ground
5
RXD/B
---
---
Receive Data
6
TXD/A
---
---
Transmit Data
PIN
Description
Wire Color
7
Positive
Red
8
Negative
Black
7 8
