4208U Vs. 4208SN

The 4208U is a universal 8-Zone wired expansion module that can be used with any Honeywell Alarm Panel that supports V-Plex Polling Loop devices. The 4208SN is an 8-Zone wired expansion module as well, but it can only be used on panels that support the 'Serial Polling' input type.

Honeywell 4208u 8 zone universal zone expansion module

Honeywell 4208sn 8 zone expansion module

Older versions of the Ademco (which became Honeywell) VISTA Series Alarm Panels that supported V-Plex technology did not support serial number devices. These panels were more simple, and the V-Plex devices that worked with them were also simple. The devices had dip switches. The dip switch settings determined the zone number(s) that would be used by the device.

Newer panel versions are able to support V-Plex devices that use a serial number to designate the device being used. The zone is programmed with an input type of ‘Serial Polling’ along with the serial number and loop number of the device. The newer panels can also still support the older style modules. This is helpful when replacing an older panel with a newer one, where the older modules installed in the field still work. For more information about this, check out this FAQ.

The chart below shows a comparison between the 4208U and the 4208SN:

Feature 4208U 4208SN
Current Draw (see below)

Polling Loop Only 28.6mA 33.6mA
Polling Loop + External Power .6mA / 28mA .6mA / 33mA
Dimensions 6-7/16” W X 4-¼” H X 1-¼” D 6-7/16” W X 4-¼” H X 1-¼” D
Resistor Value 10K EOLR w/ 300 Ohm Tolerance. Resistor is required on each zone. 10K EOLR w/ 300Ohm Tolerance. Resistor is required on each zone.
Unique Serial Numbers 128 256
Loop Response Time

400 Millisecond

10 millisecond option set via dip switch for loops A and B only

400 Millisecond

10 millisecond option set via dip switch for loops A and B only

Input Types Supported Left Loop Dip Switch / Serial Polling Serial Polling

Agency Listings

UL 985 Household Fire

UL 1023 Household Burglary

UL 609 Commercial Burglary

UL 864 Commercial Fire*

CSFM

FM

CUL

CE (Requires #N6361)

UL 985 Household Fire

UL 1023 Household Burglary

UL 609 Commercial Burglary

UL 864 Commercial Fire*

CSFM

FM (Pending)

CUL

CE (Requires #N6361)

* For UL Listed Commercial Fire Usage: Use NO contacts, Style B, and supervise these loops using Model #EOL100 fire listed 10K EOLRs (purchased separately).

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