When selecting a 4G remote communication module for your generator or genset control system, many users get confused between the Smartgen CMM366A‑4G and CMM366B‑4G. They look similar, support 4G remote monitoring, and are widely used for generator remote control. However, their I/O structure, relay output, CAN capability, and cloud platform are completely different.
In this article, we break down the key differences in clear, practical terms so you can choose the right module for your project.
Quick Overview
Both modules are designed by Smartgen for remote monitoring and control of generator sets. They support:
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4G global communication
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RS232, RS485, LINK communication ports
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GPS positioning
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Remote data upload to cloud platform
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Wide DC power input (DC8–35V, power consumption ≤5W)
But they are built for different application scenarios.
1. Relay Output & I/O Capacity (The Biggest Difference)
CMM366A‑4G
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1× programmable relay output (DO) (1A/DC30V, passive relay)
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2× digital input (DI)
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Supports alarm output, remote control, fault indication
This means you can use it to trigger an alarm, control a circuit, or link with external devices (such as sound and light alarms, circuit breakers) remotely.
CMM366B‑4G
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No relay output
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Only 2× digital input (DI)
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Focuses purely on data collection and monitoring, not control
If you need remote control or alarm output, choose CMM366A‑4G.
2. CAN Bus Compatibility
CMM366A‑4G
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No CAN interface
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Works with traditional RS485 / LINK controllers
CMM366B‑4G
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Base version: no CAN
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CAN version available: CMM366CAN‑4G
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Ideal for modern controllers with CAN bus
If your controller uses CAN, you must go with CMM366B‑4G / CMM366CAN‑4G.
3. Default Cloud Platform
CMM366A‑4G
Default: monitoryun.com (port 91)
CMM366B‑4G
Default: smartgencloudplus.com (port 21318)
Both support custom server configuration, so you can redirect them to your own monitoring platform.
Full Comparison Table
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Item
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CMM366A‑4G
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CMM366B‑4G
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|---|---|---|
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Relay Output
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1 channel
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None
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CAN Interface
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No
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Optional (CMM366CAN‑4G)
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|
Digital Input
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2 DI
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2 DI
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Main Purpose
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Remote monitoring + control
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Remote monitoring only
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Typical Cloud
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monitoryun.com
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smartgencloudplus.com
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Best For
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Gensets needing alarm/control
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Standard monitoring without control
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Which One Should You Buy?
Choose CMM366A‑4G if:
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You need remote control or alarm relay output
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You want a stable, widely used module
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Your controller uses RS485/LINK, not CAN
Choose CMM366B‑4G if:
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You only need data monitoring
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You plan to use a CAN‑enabled controller
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You prefer the newer cloud platform
If you are searching for Smartgen CMM366A-4G or Smartgen CMM366B-4G for your generator set, you may be confused about the difference between CMM366A-4G and CMM366B-4G. These two 4G remote communication modules are widely used for generator remote monitoring and control, but they are designed for different applications.
Whether you need a module with relay output for alarm and control, or a basic module only for data monitoring, understanding the CMM366A-4G vs CMM366B-4G comparison will help you make the right choice.
At genpartstec.com, we supply genuine Smartgen CMM366 modules, including CMM366A-4G, CMM366B-4G, and CMM366CAN-4G with CAN interface. We provide high-quality generator controller parts and professional technical support for global customers.
If you are looking for a reliable supplier of Smartgen 4G remote communication modules or need help selecting the correct model for your genset, feel free to contact us for more information and best prices.
Where to Get Genuine Smartgen CMM366 Modules?
At genpartstec.com, we supply:
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Genuine Smartgen CMM366A‑4G
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Genuine Smartgen CMM366B‑4G
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CMM366CAN‑4G (CAN version)
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Full technical support for wiring, setup, and cloud configuration
We are a trusted supplier of generator controller parts, communication modules, and genset accessories for global customers.
If you need help selecting the right model or want a bulk quotation, feel free to contact us anytime.