Description

Many Teracom 1-Wire devices are designed to facilitate a Linear Daisy-Chained Network Topology using integrated RJ11 connectors. The CabU_3m_RJ11 gives you a 3m distance between each sensor, which give you the greatest flexibility. See table below, part number link to the individual products.

Teracom suggests a total cable length of up to 30 meters using UTP/FTP cables. Using the CabU_3m_RJ11 cables between these devices is well within this guideline and can help maintain signal integrity over the 1-Wire bus.  RJ11 connectors are well-suited for low-speed data connections like those used in 1-Wire networks. This configuration allows for a simple and effective method to expand the 1-Wire network linearly using these sensors.

On a single network with Teracom 1-Wire devices, the practical limit is often dictated by the specific controller or module being used. Many Teracom Ethernet and GSM/LTE I/O modules, such as the TCW241, TCG140-4, TCW240B, and TCW210-TH, are designed to support up to 8 Teracom 1-Wire sensors. Some older or smaller controllers, like the TCG120 and TCW122B-CM, specify a limit of up to 4 1-Wire sensors.

Pinout of RJ-11 Connectors

	Pin	Description	UTP Wire Colour
	1	1-Wire Ground	White/Brown
	2	1-Wire Ground	White/Green
	3	1-Wire Data	Green
	4	1-Wire Ground	White/Orange
	5	1-Wire +VDD	Orange
	6	1-Wire +VDD	Brown

1-Wire Network Linear Topology

Using the 3m, or 1m, RJ-11 cables with the 1-Wire Sensors and Transmitters with dual RJ-11 connectors allow you to create a Daisy-Chained Linear Topology. The max cable length, from the Master device to the Slave device at the further point, should be less than 30m. With the limitations of the Teracom Ethernet and GSM/LTE I/O modules of a maximum of 4 or 8 1-Wire sensors, the maximum distance would be just 24m to the last sensor with the CabU_3m_RJ11 connecting every device.

1-Wire Network Stubbed Topology

Using the 3m, or 1m, RJ-11 cables with a separate 1-Wire Network would allow you to create a Stubbed Network topology. This can be achieve by using the SPL2_RJ11 cable to the 3m, or 1m RJ-11 cables. The stubs can then be connected to one of the 1-Wire sensors with screwless terminals to a network with RJ-11 sensors.