Amazon.com: USR-W630 Industrial Serial RS232/RS485 to WiFi and Ethernet Converter Supports Dual RJ45 Ethernet Ports Modbus RTU to Modbus TCP with DC Adapter Terminal Power Supply 5-36 V : Electronics
Amazon.com: LINOVISION Rugged and Versatile Cellular Router & 4G DTU with RS485, Industrial 4G LTE WiFi Router with Dual SIM Cards Slot, Supports AT&T and T-Mobile : Electronics
Modem WiFi 4G SIM Card WiFi+Routers DTU Built-in SIM Connector, Serial Port (RS-232 or RS-485) , Support Modbus, VPN, Ipsec - China 4G Lte Router and WCDMA 3G Router price | Made-in-China.com
Industrial 4G LTE cellular router supports virtual SIM and physical SI | LINOVISION US Store