Qolsys IQ Hardwire 16-F Includes 5-Band End of Line Resistors

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Like most modules that use end of line resistors for zone monitoring, the IQ Hardwire 16-F is no exception. It comes standard with 4.7k resistors, or it can support end of line resistor (EOLR) learning for values ranging from 1k to 10k. But the standard 4.7k resistors have five (5) bands.


The Qolsys IQ Hardwire 16-F is 319.5 MHz wired to wireless converter. It allows you to easily convert a wired system into a wireless system by taking over your existing hardwired sensors. The hardwired sensors will connect directly with the the IQ Hardwire 16-F module, and the converter will send 319.5 MHz wireless signals on their behalf. The system will then treat these hardwired sensors as wireless zones. You just need to make sure that you have enough wireless zones on the system itself. Each Hardwire 16-F module adds support for 16 additional hardwired zones.

If you aren't familiar with end of line resistors, they are small jumpers that are wired-in at the end of line of zones. The purpose of a resistor is to let the system know that a zone has been physically cut. If someone cuts or tampers with a hardwired zone that is configured with an EOLR, then a short will occur. This will result in a trouble condition on the system. If your system is currently in an armed state, this will cause an alarm. A shorted zone while the system is disarmed will just lead to loss of supervision for the sensor.

You must use an EOLR at each zone for the Qolsys IQ Hardwire 16-F, including with zones that do not have a connected sensor and are not actively being used. Any unit manufactured before week 40 of 2019 was required to use 4.7k resistors at all 16 zones. But from week 40 of 2019 and onward, Qolsys began manufacturing units that support end of line resistor learning. These newer units support Legacy Mode (where 1k to 10k resistors can be used) and UL Fire Mode (where 4.7k resistors must be used at every zone). For information on switching between the two (2) resistor modes, please see this FAQ.

What's somewhat unique about the 4.7k resistors included with the Qolsys IQ Hardwire 16-F is that they use five (5) bands instead of four (bands) like we mostly encounter. The 5-band resistors for the Hardwire 16-F are Yellow-Violet-Black-Brown-Brown. This equates to a 4.7k ohm resistor with a tolerance of +/- 1%. This differs from the four (4) band 4.7 k resistors that we often see, which are Yellow-Violet-Red-Gold. Those four (4) band resistors offer a tolerance of +/- 5%.

Really, there is no difference in the way you install these resistors. But it can be good to know if you are setting up a a Qolsys IQ Hardwire 16-F device. It is advised that you connect the resistors and sensors before attempting to enroll the module with the panel. We also recommend clearing the memory through a factory default for module before enrollment. More information can be found here.

If you have any questions about the Qolsys IQ Hardwire 16-F or any of our other products, or if you want to learn more about our monitoring services. Please reach out to us by emailing support@alarmgrid.com. We operate support hours from 9am to 8pm ET M-F. We look forward to hearing from you!

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