1 port gsm fixed wireless terminal Etross-8818 with LCD display

LCD display 1 channel gsm gateway GSM FWT-8818 SMS to control alarm or switch

1, General Descrption:

GSM FWT-8818 is a GSM to Analog Converter, the device can produce a FXS line to allow a regular phone to be 

connected and used just like a local landline(PSTN) except your calls will go out the GSM network. 

This device can both receive and make calls. 

2.Features: 

1) LCD display GSM FWT,Simple to install and easy to maintain

2) Steady module(SIM500W,300W,Quectel M35) and reliable design ensures good performance

3) Provides optimized circuit directly connecting the exchange device for extensions

4) Compatible to most telephones, PBX (for call extensions), Alarm panels (for security) and VoIP gateways 

(for call terminations)

5) Strong signals with high gain antenna

6) Attractive plastic casing

7) SIM card supported (1.8V, 3V)

8) Caller ID display

9) Provides reversal polarity signal for metering

10) No noise and clear voice

11) Suitable for wide voltage range and low power consumption

12) Suitable for all kinds of weather and environmen

13) RJ-11 ports 

14) Locking PIN / network (optional)   

15) Back up Li-ion battery( Optional) 7.2V 1300mAh.standby 24hrs,talking time: 2.5hrs.

3,Technical Specifications
Air interface standard: GSM850/1900Mhz,900/1,800Mhz phase 2+ full band 
Frequency ranges:
 A) GSM 850                                   GSM 1900:
 I) Transmission: 869.2 ~ 893.8MHz      I) Transmission: 1, 930 ~ 1, 990MHz
 Ii) Reception: 824.2 ~ 848.2MHz         Ii) Reception: 1, 850 ~ 1, 910MHz 
 B) GSM 900:                                  GSM 1800: 
 I) Transmission: 890 ~ 915MHz           I) Transmission: 1, 710 ~ 1, 785MHz              
 Ii) Reception: 935 ~ 960MHz              Ii) Reception: 1, 805 ~ 1, 880MHz 
Phone interface: supply RJ-11 Phone Interface
Hanging voltage: 45V
Picking off voltage: 30mA / 41mA
Dialing tone Frequency: 450Hz
Antenna interface: Antenna amplifying>2.5db
Sensitivity:<-104DBM
Transmitting power<3W

Color: White 

AC-Adapter interface: Input: AC 110~240VAC  50~60Hz
                    Output: 12DC 1A.

AC-Adapter type: EU, US, AU, British can be optional

SMS Management:

1. SIM credit balance inquiry;

2. Control alarm panels;

3. Reply can be used to turn on/off the Air conditioning, lights etc.

Packing List

SMS Feature details:

* SMS support for residual credit: 99% of Italian and European SIM card are pre-paid. This means that the credit can be expired and you won't know what's going on, unless you get the sim card out of the gsm fwt and test it on a cellphone. This function would work like this:

with your cellphone you send an SMS to the sim card inside the gsm with this format: "CREDIT, xxxx, " where xxxx is the sms number of the carrier and is the command to ask for the residual credit;

- the gsm fwt will receive this sms from you and will forward the to the xxxx number;

- the gsm fwt will receive back the sms from the carrier;

- the gsm fwt will forward this sms to you.

-->please mind the sms string must be separated by ','

-->if the carrier no response in 3 minutes, fwt will not forward sms to you.

* incoming sms support for alarm panels: currently our alarm panels don't support sms. Our panels support the telecontrol: you call them, you put a password through your cellphone keyboard then then you give a command. Everything with DTMF commands. My idea is to let the gsm fwt to simulate the phone call by sending proper DTMF commands to the alarm panel.

For example, currently it works like this:

- I call the gsm fwt, the alarm panel will ring 5-7 times and answer the phone call with a beep;

- I hear the beep on the cell phone and I put the password pressing, for example 0 0 0 0 on the cellphone keyboard;

- the panel will acknoweldge the password with a beep;

- I give a command with a DTMF keyboard key;

- the panel acknowledge the command;

- I close the phone;

This can be easily emulated like this:

- I send an sms to the gsm fwt's SIM card like: "COMMAND,, "

- the gsm fwt will receive it and will simulate a phone call to the alarm panels, which is connected to the rj11 outlet;

- it will wait for the alarm panel to answer, then put the then the and then close the line;

- an sms will be sent back to the user;

Obviously I will send you the alarm panels for you to test but I think it should be easy, as all industrial gsm modules support sms.

-->please mind the sms string must be separated by ','

--> we connect fwt to the alarm panel LX-HS05 and test as:

-User send sms: "COMMAND, 0000, 7"

-fwt send ring

-when alarm panel answer call, fwt detect "DI-DI" sound from panel, then send DTMF '*' to panel, then detect "DI" from panel, then send to panel, then detect "DI-DI-DI-DI"(password correct) or "DI-DI-DI" (password not correct), then send if password correct.

-if setting panel success fwt will send "panel setup ok" or "panel setup failure" if failure.

Then we have two relays:

* first relay: this is clean contact relay (7 Ampere):

this relay can be used to turn on/off the Air conditioning, lights and so on by sms. You can trigger this output by sms like "DOMOTICA ON" will turn it on "DOMOTICA OFF". This function has nothing to do with the alarm panel.

--> fwt will send back sms "relay turn on." or "relay turn off." if command accept.

* second relay: normally closed relay output for low battery OR normally closed relay output for no gsm signal: if there is no gsm signal for more than x minutes (x can be set), then this output will be triggered. This can be useful to reveal gsm jamming made by a thieft. Do you have a gsm jammer? how does it work? This output can be connected by wire to the alarm panel. The same relay will also have another function: if the internal battery of the gsm fwt will reach a low level, it will trigger this output. The two functions for this relay can be set: you can enable one or both functions.

-->we have 2 setting commands by DTMF

-->fwt can authenticate or not incoming sms number