PG46-DC RS485/Ethernet 4G LTE Router (DC Power)

The IIoTSys PG46-DC is an RS485 and Ethernet 4G LTE router for remote monitoring and networking of industrial serial and Ethernet equipment. This DC-powered model accepts 9–48 VDC @ 1 A. It uses a MIPS microcontroller at 320 MHz, with 16 MB Flash and 32 MB SRAM, and runs the OpenWRT Linux operating system.

Two 4G band options are available. Each option combines LTE-FDD and LTE-TDD bands in one selection. Check the selected option against the intended mobile operator before deployment. The device uses a Nano SIM card with 1.8 V or 3 V support and has an SMA cellular antenna connector. The band selection identifies the supported 4G radio bands, rather than a guaranteed connection on every network. The technical specifications list non-CA LTE Category 4, with LTE-FDD rates up to 50 Mbps uplink and 150 Mbps downlink, and LTE-TDD rates up to 35 Mbps uplink and 130 Mbps downlink.

The unit provides one 10/100M Ethernet port. The port defaults to LAN and can be configured as WAN; when used as WAN, it can connect to a router LAN port for network access. Network working modes include transparent transmission, HTTP, MQTT, and WebSocket. The device supports a maximum of 5 TCP or UDP connections, with a 1400-byte data cache for each connection. Documented network protocols include IP, TCP, UDP, DHCP, DNS, HTTP server and client, ARP, AutoIP, ICMP, Telnet, NTP, and Modbus TCP. VPN support includes PPTP, L2TP, and L2TP+IPSEC. APN is supported. Modbus functions include Modbus master and Modbus TCP to Modbus RTU conversion. These functions cover serial and Ethernet networking without requiring a change to the connected equipment's interface.

The serial interface is one RS485 port. Serial framing includes 7 or 8 data bits, 1 or 2 stop bits, and None, Even, or Odd parity. Software flow control is specified. The baud range is labeled TTL: 2400–460800 bps. Connect A+ to A+ and B− to B−. Pin 6 is the RS485 GND and is usually left unconnected; a shared GND connection is suggested when interference is very severe. The RS485 interface operates in half-duplex mode. It supports up to 32 devices and a maximum cable length of 1200 m. The installation instructions call for a 120 Ω termination resistor when cable length exceeds 300 m.

Configuration is available through serial AT commands and companion configuration software over the serial or network connection. Registration packets and heartbeat packets can combine ICCID, IMEI, IMSI, software version, and cellular connection status. Firmware updates are available through UART and network OTA. The technical specifications also list TLS v1.2, AES 128-bit, and DES3. Scheduled remote-management working time can limit operation to a defined period to reduce data usage.

The enclosure measures 102.03 × 64.95 × 27.50 mm and mounts on a C45 guide rail. Operating temperature is −40 to +70 °C. Storage conditions are −40 to +85 °C and 5–95% RH without condensation. Net, Active, Power, and Link indicators show cellular network status, Ethernet or UART activity, power, and server connection status. After power-up, hold Reload for more than 3 seconds and release to restore factory settings. Reset performs a hardware reset.