The GSM/GPRS/3G/4G IOT M2M Modem D223 is a powerful and programmable multi-purpose wireless cellular modem and datatransfer unit (DTU). It embedded high reliable 32bit ARM9 MCU and industrial GSM/GPRS/3G/4G Cellular Engine inside.It provides a secure, high speed, reliable wireless data transmission between com port and internet connection forcustomers over GPRS/3G/4G wireless cellular network. Also, it can be used as SMS modem and Modbus RTU to Modbus TCP
converter.
Moreover, it is suitable for transparent transferring SMS text between mobile phone, computer and RS232/RS485/TTL Serial port over GSM/3G/4G wireless cellular network. It can be used as SMS modem supports transparent transferring
SMS, AT Commands, and provides 1 digital input can be used as SMS Alarm and Pulse Counter Alarm, too.

Can be operated from anywhere, no distance limitation;
Quad band 850/900/1800/1900Mhz GSM GPRS Module inside;
3G UMTS/HSDPA/4G Modules are optional.;
Embedded 32 bit ARM9 MCU, reliable performance with in-built watchdog;
Multi-functional, supports AT Commands, Transparent SMS and Data Transfer;
1 TTL port can be used for TTL device data transfer;
1 three-wire RS485 serial port, RS232 is optional, Baud rate adjustable from 1200~115200bps, 簣 15KV ESD protection;
1 digital input, supports dry contact, wet contact, pulse counter can be used as alarm, or trigger to wakeup or online event;
Powerful programmable features, supports programmable handshake message,etc;
Real-time online data transfer, supports always only or event triggered online;
Build-in protocol stack, support TCP/UDP network protocol;
Support transparent data transfer and Modbus TCP protocol conversion;
Heartbeat function and autodial to ensure the device online;
Supports DNS and static data service center IP address;
Supports wakeup by SMS, Call and Comport, Timer, Digital input or pulse counter input;
Automatically restart the cellular module while communication failure, and resend the data in the cache, the cache capacity up to 12K bytes, also when cellular communication failure will alert by SMS text;
Supports remotely restart the device, and configure it by SMS commands remotely;
Up to 10 user's phone number to receive alarm and daily report SMS/Call;
Industrial class design suitable for long time work applications;
Support configure parameters, load profiles and upgrade the firmware via PC;
Wall mount or 35mm standard DIN rail Design, convenient installation,
Metallic cover, small size, exterior dimension is L70*W88*H30mm.