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Summary

Constant trouble tone on the master station. All other functions work normally, but trouble tone is always sounding.

Cause

Break in the wire to NHR-SP or no jumper in CN-104.

Solution

Check wire connection to NHR-SP. If no duty station is used, then make sure that there is a jumper in CN-104 on NHX-80X. (No jumper on CN104 if Duty Station is included. INSTALL jumper if there is no Duty Station connected.) [post_title] => Constant Trouble Tone on NHX Master Station [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => constant-trouble-tone-on-nhx-master-station [to_ping] => [pinged] => [post_modified] => 2025-10-01 11:29:34 [post_modified_gmt] => 2025-10-01 18:29:34 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/constant-trouble-tone-on-nhx-master-station/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 37234 [post_author] => 18 [post_date] => 2021-08-16 14:28:11 [post_date_gmt] => 2021-08-16 21:28:11 [post_content] =>

Line Drawing

Specifications

Power Source

Provided by NHX-80

Communication

Hands-free

Communication Output

100mW @ 20 ohms

Calling Capacity

Up to 80 stations

Wiring

3 twisted pair shielded low capacitance cable (12 pF/Ft) from NHX-80X Aiphone #862208 With NHR-3A-4 Zone Indicator Light: 3 twisted pair + 1 common wire per zone Aiphone #862208

Wiring Distance

165’ to farthest patient station 330’ Max. trunk line distance (per trunk), including length of trunk line, plus wire length t-tapped to each patient station from trunk line.

Mounting

Flush mount

Electrical Box

2-gang box or ring

Certification

UL 1069 Listed C-UL Canadian Standard C22.2

Dimensions

4-1/2” x 4-9/16” x 1-13/16” [post_title] => NH-1SA-A Technical Specifications [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => nh-1sa-a-spec-sheet [to_ping] => [pinged] => [post_modified] => 2025-03-13 10:26:21 [post_modified_gmt] => 2025-03-13 17:26:21 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/nh-1sa-a-spec-sheet/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 37239 [post_author] => 18 [post_date] => 2021-08-16 14:32:20 [post_date_gmt] => 2021-08-16 21:32:20 [post_content] =>

Summary

Some applications for Nurse Call systems require multiple Duty Stations. The call tone sounds and the LED lights on the Duty Stations indicate a call on the system. The drawing below indicates the wiring for up to five Duty Stations on one system. [mkb-warning]The application for more than one Duty Station with the NHX CommuniCare system does not carry the UL 1069 Listing.[/mkb-warning]  

Wiring Diagram

Notes

1. Duty Station #1 is wired directly to NHX-80X.
2. Duty Station #2 through #5 can be homerun or daisy-chained from the CCU. The brown wire connects directly to the A+ terminal, with all other wires paralleled.
3. The total amount of wire used to connect the NHR-SP's must not exceed 400'. If so, the tone volume level will be affected.
4. The TONE OFF button works independently at each Duty Station.
5. If the tone volume at the Duty Stations is too low, increase the main volume control on the back of the master station. If more volume is required, an external amplifier may be required. (Contact Technical Support for more information.)

[mkb-info]If more than 5 Duty Stations are required, please contact a Senior Technical Support Representative at one of the extensions listed below. [/mkb-info]   [post_title] => Connecting Multiple Duty Stations to an NHX Series System [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => up-to-5-duty-stations-in-an-nhx-series-system [to_ping] => [pinged] => [post_modified] => 2025-10-30 12:09:37 [post_modified_gmt] => 2025-10-30 19:09:37 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/up-to-5-duty-stations-in-an-nhx-series-system/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [3] => WP_Post Object ( [ID] => 37458 [post_author] => 18 [post_date] => 2021-11-30 16:07:26 [post_date_gmt] => 2021-12-01 00:07:26 [post_content] =>

Line Drawing

Specifications

Power Source

24V DC supplied by two PS-2420UL power supplies

Current Consumption

Maximum 4A

Station Capacity

50 Stations. For an additional 30 stations add NHR-30K.

Wire Type

All wire is twisted, shielded, low capacitance (12 pF/Ft). 5 twisted pair to NHX-50M Master Station - Aiphone wire #862210 3 twisted pairs to NHR-SP Duty Station - Aiphone wire #862208 3 twisted pairs (plus 1 wire for zone light) trunk line to patient stations - Aiphone wire #862208 5 conductors to NHR-3A-4 Zone Light - Aiphone wire #841806

Wiring Distance

22AWG 65’ to NHX-50M 65’ to NHR-SP 165’ to the farthest patient station (ea. trunk) 330’ Max. wire distance per trunk line, including wire length t-tapped to each patient station from the trunk line. 18AWG 165’ to NHR-3A-4

Mounting

Surface wall mount or 3-gang box

Dimensions

18-1/8” H x 13-3/8” W x 3-7/8” D

Weight

Approx. 0.46 lbs (210g) [post_title] => NHX-80X Technical Specifications [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => nhx-80x-technical-specifications [to_ping] => [pinged] => [post_modified] => 2025-04-10 13:55:48 [post_modified_gmt] => 2025-04-10 20:55:48 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/nhx-80x-technical-specifications/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) ) [post_count] => 4 [current_post] => -1 [before_loop] => 1 [in_the_loop] => [post] => WP_Post Object ( [ID] => 37231 [post_author] => 18 [post_date] => 2021-08-16 13:39:40 [post_date_gmt] => 2021-08-16 20:39:40 [post_content] =>

Summary

Constant trouble tone on the master station. All other functions work normally, but trouble tone is always sounding.

Cause

Break in the wire to NHR-SP or no jumper in CN-104.

Solution

Check wire connection to NHR-SP. If no duty station is used, then make sure that there is a jumper in CN-104 on NHX-80X. (No jumper on CN104 if Duty Station is included. INSTALL jumper if there is no Duty Station connected.) [post_title] => Constant Trouble Tone on NHX Master Station [post_excerpt] => [post_status] => publish [comment_status] => open [ping_status] => open [post_password] => [post_name] => constant-trouble-tone-on-nhx-master-station [to_ping] => [pinged] => [post_modified] => 2025-10-01 11:29:34 [post_modified_gmt] => 2025-10-01 18:29:34 [post_content_filtered] => [post_parent] => 0 [guid] => https://aiphone.local/kb/constant-trouble-tone-on-nhx-master-station/ [menu_order] => 0 [post_type] => kb [post_mime_type] => [comment_count] => 0 [filter] => raw ) [comment_count] => 0 [current_comment] => -1 [found_posts] => 14 [max_num_pages] => 4 [max_num_comment_pages] => 0 [is_single] => [is_preview] => [is_page] => [is_archive] => 1 [is_date] => [is_year] => [is_month] => [is_day] => [is_time] => [is_author] => [is_category] => [is_tag] => [is_tax] => 1 [is_search] => [is_feed] => [is_comment_feed] => [is_trackback] => [is_home] => [is_privacy_policy] => [is_404] => [is_embed] => [is_paged] => [is_admin] => [is_attachment] => [is_singular] => [is_robots] => [is_favicon] => [is_posts_page] => [is_post_type_archive] => 1 [query_vars_hash:WP_Query:private] => aa1489ec83a575904743fbe750d57591 [query_vars_changed:WP_Query:private] => 1 [thumbnails_cached] => [allow_query_attachment_by_filename:protected] => [stopwords:WP_Query:private] => [compat_fields:WP_Query:private] => Array ( [0] => query_vars_hash [1] => query_vars_changed ) [compat_methods:WP_Query:private] => Array ( [0] => init_query_flags [1] => parse_tax_query ) [query_cache_key:WP_Query:private] => wp_query:926dd73c7dfb18e5a0751e78e3cda992 )