- Place of Origin: Guangdong, China (Mainland)
- Brand Name: HOMTECS
- Model Number: SM-G12T
- GPRS: GSM900MHz/DCS1800MHz
- Antenna: 50ΩFAKRA SMB terminal male purple
- SIM Card: 1.8V/3V self-adaption SMT package
- Serial port type: TTL
- Serial port speed: Baud rate115200bps
- Power supply: +12V DC
- Consumption: 12V DC power source testing environment
- working temperature: -30~75℃
- storage temperature: -40~85℃
- Dimension: 75 x 50 x 7mm
Packaging & Delivery
|Packaging Details:||standard package|
|Delivery Detail:||samples 3working days, MP 22working days|
Intelligent Vehicle security module SM-G12T
Intelligent security module is mainly for automobile market, with auto-speech and SMS warning function. it can automatically detect automobile’s ABRS(air bag restraint system) warning information, ignition information, car door and car cover status information, and car storage battery information, and send SMS to car owner with address information in details when unusual situation happens. and auto dial with speech warning function.
50ΩFAKRA SMB terminal male,purple
1.8V/3V self-adaption, SMT package
Serial port type
Serial port speed
12V DC power source testing environment
sleep: 5ma(can wakeup by data)
standby: 35ma(can wake up by SMS)
75 x 50 x 7mm
150g(no include antenna)
Security module data extended function
1. Serial port data packet identification
Notice--- if DTR is always in +5V~+15V, it shows that modem already shut inner power source of module, PWR LED keep on 8 second, flicker once, then, keep on 8 seconds.Repeating, net light off.
Security module communicate with user equipment via serial port, module will handle the data received from serial port in subpackage. According to the maximum packet lenght, it take it to be a packet which reach the maximum packet length, and if this data don’t reach the maximum packet length, then,depend on data interval, if there is no data received after interval, then ,it take the data received before to be a packet.
2. Auto PPP dialing
Security module use auto PPP dialing mode to get into GPRS mobile net, and maintain the validity of link automatically, when link is off ,it will automatically dial for reconnection.
3. UDP connection
Through 4 pin of serial port (PC-DTR), send out signal to control off- power reset inside of module, wave patten is as following, Monitoring processor inside of module check DTR input signal, RS232 electrical level is -5V~-15V, modem work well
In unusual situation, it’s necessary to restart modem, DTR input +5V~+15V electrical level.3 seconds, it return to be -5V~-15V,modem will automatically reset module, PWR light keep on 8 second, flicker and work well.
ecurity module support UDP line mode,this mode don’t need handshake with master station,and no response mechanism, suitable for case which user’s equipment have complete protocol. User equipment and master station judge if data or command is answered back themself
The disadvantage of UDP link mode is no response mechanism. And advantage is no need to maintain link, send or receive data anytime,it can save lots of flow.
UDP and TCP is alternative.
4. TCP connection
modem serial port(DCE mode) can connect with PC serial port(DTE mode) directly
Security module support TCP link mode, which need handshake with TCP SERVER of master station, reply after each data packet is sent,it guarantee data sending and receiving and suitable for most of circumstances, especially the circumstance that user equipment don’t have agreement.
The advantage of TCP link mode is response mechanism, guarantee the success of data sending and receiving ,also find if link is off or not on time. The disadvantage is it take extra flow for response packet,meanwhile, because of the high latency character of mobile communication net, it make TCP protocol stack retransmission repeatedly, it waste flow.
UDP and TCP is alternative
5. PING function
Security module support PING function, it can send ICMP packet to target address and detect its reply,this function can use to detect if PPP dialling link offline .
Usually,it’s for UDP communication without heartbeat configuration.
6. DNS function
DNS function is for circumstance that master station don’t have fixed IP, every time after master station change IP, it send new IP to DNS server. Each time when security module is online,it analysis realm name corresponding IP in DNS server,then,use this IP address to link master station.
7. Heartbeat function
Maintain link, sending heartbeat packet can postpone the time that mobile net take back resource,make UDP or TCP link effective
Identifying terminal equipment,heartbeat packet can attach ID into end of packet,master station can identify each terminal equipment matched with each link by this ID.
8. Status prompt
To help user equipment to know the operation status of security module,it will send some information to user equipment in regular format by serial port.
Status prompt information have 3 grades.
Only allow to choose one of them
9. Online mode
It have two operation mode: online mode and wakeup mode
Under online mode,security module start PPP dialling then,connect to master station,it won’t log off,if link is off, it will reconnect master station after a while.
The advantage of online is always online, can send or receive data anytime, the disadvantage is needing more flow and a mass of heartbeat packet to maintain link.
Online mode is suitable for the circumstance that data is sent or received frequently
10. Wakeup mode
It has two operation mode: online mode and wakeup mode
Under wakeup mode,security module is in standby mode after starting up. When receiving a data or wakeup SMS from user equipment, it start PPP dialing,connecting to master station,. after that,it break off UDP or TCP link and PPP dialing after a fixed time,return to standby mode.
The advantage of Wakeup mode is online according to needs,user equipment or SMS can wake up for online, it can save lots of flow. The disadvantage is equipment will in standby mode for long time,master station can not use the way of active polling, if use SMS to wake up, it need some cost.
Wakeup mode is suitable for the circumstance that data isn’t sent or received frequently.
11. Serial port configuration
Security module can configurate local parameter by serial port,its serial port communication can send special order under transparent mode to switch to configuration mode to finish parameter configuration function.
The order of configuration mode refer to serial port configuration order.
Security module have software to configurate parameter. Pls refer to DTU parameter configuration software V1.0
12. Local upgrade
Security module use special ISP upgrade software to update application program,pls refer to ISP upgrade software manual
13. Remote management
Security module have long-distance management function,it can send special SMS to security module to make it online,and log in appointed server,and manage it by long-distance management order,in actual use.it will build a standalone gallery, distinguish from transparent transmission service of user data.
Long-distance management can configurate security module parameter,upgrade program,restart control.
Security module have correspondent management software,which can manage directly, pls refer to software manual or develop with long-distance management agreement
14. SMS configuration
Security module support SMS to configure parameter, considering the content control of SMS,SMS parameter configuration only support modify master IP address and port parameter.
If need configurate more parameter,it can be managed by remote control.
module communicate with user equipment via serial port, module will handle the data received from serial port in subpackage.
According to the maximum packet lenght, it take it to be a packet which reach the maximum packet length, and if this data don’t reach the maximum packet length, then,depend on data interval, if te is no data received after interval, then ,it take the data received before to be a packet.
Seity module communicate with user equipment via serial port, module will handle the data received from serial port in subp
According to the maximum packet lenght, it take it to be a packet which reach the maximum packet length, and if this data don’t reach the maximum packet length, then,depend on data interval, if there is no data received after interval, then ,it take the data received before to be a packet.