Moxa OnCell G3110 / G3150 Replacement:
Direct 4G LTE Cellular Migration
Don’t let 2G/3G network shutdowns break your remote SCADA polling. Upgrade to robust 4G LTE serial cellular gateways with zero wiring modifications and transparent Modbus routing.
The 2G/3G Sunset Reality: Why Your OnCell Modems Are Going Offline
Legacy cellular gateways like the OnCell G3110 and G3150 rely on GSM, GPRS, and HSPA modules. With AT&T, Verizon, Vodafone, and Optus actively shutting down legacy cell towers, these devices are physically losing their RF signals. Firmware updates cannot fix hardware basebands.
The CGNAT Trap (Private IPs)
In the 3G era, carriers often provided static public IPs, allowing your SCADA to use “TCP Server” mode to poll the gateway. Today, 4G LTE carriers issue CGNAT (Private) IPs by default. If your replacement gateway cannot actively initiate connections (TCP Client/MQTT), your SCADA will never reach it.
The Overpriced OEM Upgrade
Upgrading to the manufacturer’s own LTE variants (like the G3150A-LTE) often introduces extreme brand premiums and volatile 16-week lead times. You need an industrial-grade Cat-1 LTE alternative that ships today without the OEM tax.
Overcoming LTE CGNAT: Keep SCADA Polling Without Proprietary Protocols
The Valtoris VT-DTU500 is engineered specifically to break through 4G carrier firewalls and keep remote assets online autonomously.
1. Active Network Penetration
The VT-DTU500 does not wait passively for SCADA pings but supports TCP Client mode and MQTT pushing. It actually punches through the CGNAT firewall from the field to your central server using strong protocols like IPsec and WireGuard VPNs. Combined with our VirCom utility, your SCADA software continues polling COM3 as if the device was locally attached.
2. Hardware-Level Link Recovery
You don’t need expensive, proprietary software like “GuaranLink” to stay online. The VT-DTU500 utilizes native ICMP Ping Detection and an independent hardware watchdog. If the LTE link drops and the ping fails, the baseband is physically reset, guaranteeing your solar arrays and lift stations never hang in a “half-open” state.
Pin-to-Pin Hardware Compatibility: DB9 & Terminal Block Ready
The Valtoris VT-DTU500 acts as a direct physical and electrical drop-in for the Moxa OnCell series. Keep your existing DIN-rails and control cabinets intact.
| Engineering Parameter | Moxa OnCell G3110 / G3150 | Valtoris VT-DTU500 Series |
|---|---|---|
| Cellular Network | Obsolete 2G/3G (GPRS/HSPA) | Modern 4G LTE Cat-1 (Global Bands) |
| Serial Interface | DB9 (RS232) / Terminal (RS422/485) | Direct Match: DB9 Male (RS232) & TA/TB Terminal (RS485) |
| Input Voltage | 12 to 48 VDC | Compatible: 9 to 48 VDC |
| Modbus Handling | Basic Transparent TCP | Advanced: Storage Modbus Gateway & Multi-Host Arbitration |
| CGNAT Bypass | Requires Static IP SIM Cards | Native TCP Client, IPsec/WireGuard, & MQTT Push via DHCP |
| Availability | EOL / Extreme Lead Times | In Stock for Immediate Global Dispatch |
Software Configuration Mapping: No SCADA Rewrites
Migrating to a new hardware vendor shouldn’t require reprogramming your PLCs. Here is the exact parameter translation from Moxa’s NPort Administrator to the Valtoris Web GUI.
(Bypasses 4G CGNAT Firewalls)
Field Engineer FAQ: Moxa OnCell Migration
Straight answers to the technical hurdles integrators face when moving away from legacy 3G gateways.
We use Moxa OnCell G3150 in TCP Server mode. When we upgrade to 4G LTE, our SCADA master can no longer connect. Will your gateway fix this?
Moxa’s GuaranLink keeps our remote solar modems online when cell towers drop. How do your gateways prevent half-open cellular hangs?
Is the serial baud rate and Virtual COM driver compatible with older RTUs (like Allen-Bradley MicroLogix or Modicon)?
Test in your topology by ordering a single unit on line. Once you have validated the performance and you have placed your first bulk order (20+ units), the full cost of your evaluation unit will be credited against the project invoice.
