Signshine S3321 serial GPRS AT Command modem is a kind of cellular terminal device with RS232/RS485 that provides data transfer function by public GPRS network.

Industrial serial GSM AT Command modem adopts high powered ARM9 CPU and embedded real time operating system, integrates all the commonly used protocols, such as TCP/IP/UDP and so on, from logical link layer to upper application layer protocols. It provides a secure, high speed, reliable wireless internet connection for customers and supports several ways that trigger DTU to be online, including SMS and data. It also supports double or several data centers.

This serial RS232 modem has been widely used in M2M/SCADA field, such as power automation, transportation, financial service terminal, factory automation, water, oil&gas, large machine maintenance,
Environment, building automation, outdoor digital signage ect

Industrial Design
1. Industrial high-powered embedded 32 bits CPU
2. Industrial high-powered cellular module
3. Real time OS with completely full TCP/IP protocol
4. Strengthened PCB which follows the principle of 20H and 3W, and adopts health benefits material to ensure the product stability
5. Industrial grade rigorous screened components
6. Industrial power adapter, wide voltage power supply design, power range DC7-32 V, reverse-voltage
And overvoltage protection
Stability and Reliability
1. Three-tier system protection, based on the system protection of software protection and WDT, It
2. Supports VMW (Virtual Man Watch)function
3. SIM/UIM port: 15KV ESD protection
4. RS232/RS485/RS422 port: 15KV ESD protection
5. Housing: Iron, providing IP41 protection, radiation protection, anti-interference, lightning protection
6. Design, special for outdoor harsh environmental application
7. All modules are certified by CGD/CE/FCC certificate
8. Support dynamic domain name(DDNS) and IP access to data center
9. Design with standard TCP/IP protocol stack
10. EMC&EMI outstanding performance, passed 3000V electrical shock test&EMC test
High Performance
1. TCP/UDP transparent data transfer, supports several work mode
2. Support APN and VPDN
3. Support DDNS and IP access to data center
4. Support double data centers for backup
5. Support several data centers
6. Support auto recovery mechanism, including online detect, auto Re-dial when offline to make it always online
7. Support multi online trigger ways, including SMS, ring and data.
8. Support link disconnection when timeout
9. Adopt smart online keeping technology to make sure that DTU is always online
10. Support SMS backup and emergency report
11. Support RSA and RC4 encryption arithmetic
12. Standard AT command interface
13. Support telnet function
14. Support common MODEM function
15. Lower consumption design, sleep mode lee than 1mA, standby mode less than 15mA, communication mode less than 35 ma
16. Support console upgrade firmware
17. Support multi OS, such as WINDOWS, LINUX, SCO UNIX ect
Easy to Use
1. Graphical configuration tool which provides fast configuration and bulk configuration
2. Center software based on C, VC, VB, DEPHI language
3. Compatible with third party software
4. Communication interface: RS232/RS485/RS422/TTL/USB/RJ45
5. Network type: GSM/GPRS/CDMA/EDGE/WCDMA/EVDO/HSPA/HSPA+/LTE
6. Various of DLL based on C, VC, VB, DEPHI language, provide user guide
Checkout software, Serial debugging software, network speed detection software, provide a different level of debugging output