2-4 × Serial ports in a single module.
Configurable for RS232/422/485 modes.

The COM4 module features 2 to 4 serial ports (depending on modes configured), each with fully configurable serial port options.

Choose your port modes:

Configure each port to operate in your required serial port mode. Up to 4 ports of RS232 without flow control.

Need more serial ports?
Just get another module.

The beauty of the modular controllers is their flexibility. Need more of a specific port? Get another module and plug it in.

Fully configurable.
Baud rates, flow control, etc.

Each port can be fully configured with a wide range of baud rates, flow control options, stop/start bits, parity, and so on.


The COM4 module features 2-4 user configurable serial ports, and comes with spring terminals for quick and easy, yet secure connections to control external serial devices. Plug it into a modular controller to add serial port control to your system.


The COM4 can be setup to send notifications of incoming data per port. Notifications can be sent as a broadcast to all CFLink devices, to specific CFLink IDs or both.

Passthrough Modes

Any device on the CFLink network, including the COM4 module, can be configured to passthrough their incoming and outgoing data to the LAN Bridge, for direct Ethernet access (TCP or UDP).

Serial Port Modes

The number of available serial ports depends on the modes they are configured in. For instance, 4 separate ports can be defined for RS232 without flow control. But only 2 ports can be configured if both set to RS485.

Advanced Details

For more advanced details on the COM4 module, see the CFLink protocol documentation for the MOD-COM4.

GalleryHigh res photos in downloads section

Technical SpecificationsSee hardware documentation for more details

Module Connector 24-pin connector to connect to modular controller unit
COM 1-4 2 x detachable 6-pin 3.50mm terminal block consisting of 2 to 4 channels of serial ports.
Wire range: 24-16AWG
Top Panel
Clip Secures and releases the module from the modular controller unit.
Label Model and serial number information.
Power Consumption Power usage 200mW maximum, powered by modular controller DIN-MOD4 or MOD4 (not included)
Enclosure Polycarbonate with dark grey matte finish
Height 32.8mm (1.29in)
Width 40mm (1.57in)
Depth 68mm (2.68in)
Weight 0.05kg (0.11lbs), Shipping 0.2kg (0.44lbs)
Environmental & Regulatory
Temperature 5°C to 45°C (41°F to 113°F)
Humidity 20% to 85% RH, non-condensing
Certification FCC, CE, C-Tick
Warranty 5 years limited warranty

Downloads & Documentation


Quick Reference Guide
Modules Quick Reference Guide includes details for all of our modules, such as pinout diagrams and general connectivity details.

Product Spec Sheet
Single page specification sheet.

Application Diagrams

Residential Application Diagram - Whole House
Residential - Whole House
Typical whole home automation diagram

download PDF
Commercial Application Diagram - Boardroom
Commercial - Board Room
Typical board room automation diagram.

download PDF

High Resolution Photos

Coming Soon...