The SPMWHT541MD5WAPMS3 is a Modbus Interface Modem from Sierra Wireless. It is designed for applications requiring low-level integration and support of Modbus communications, such as remote control and SCADA systems. This modem features a port for an external SIM card, the ability to support up to 5 Mbps data rate, data encryption, and support for standard wireless WAN networks. It also features an embedded web server, SMS messaging, and support for various Modbus protocols.