M-485B Horn Signal Controller Instructions
Rev. 4/12/2022
Customer Support: 1-920-793-4507
Signal codes produced by the M-485B, and their COLREG references include:
a.) One Long Blast (4-6 seconds)
“A power-driven vessel making way through the water shall sound at intervals of
not more than 2 minutes, 1 prolonged blast.”
b.) Two Long Blasts (4-6 seconds each)
“A power-driven vessel underway but stopped and making no way through the
water shall sound at intervals of not more than 2 minutes two prolonged blasts in
succession with an interval of about 2 seconds between them.”
c.) One Long and Two Short Blasts
“A vessel not under command, a vessel restricted in her ability to maneuver, a
vessel constrained by her draught, a sailing vessel, a vessel engaged in fishing and
a vessel engaged in towing or pushing another vessel, shall, instead of the signals
prescribed in paragraphs (a) or (b) of this Rule, sound at intervals of not more
than 2 minutes, three blasts in succession, namely one prolonged followed by two
short blasts.
PACKAGE CONTENTS
The M-485B Horn Signal Controller is assembled and shipped complete, including cables for
connection to the horn, main power, and Model M-129 Rocker Switch. Enclosed in a separate
poly bag taped to the M-485B are the M-129 Rocker Switch, P548-04 Mounting Bezel, and
P356-11 Nameplate. There are no other loose items in the shipment other than included
instructions.
ELECTRICAL POWER REQUIREMENTS
Main Power circuit for M-485B: 12-24 Volts D.C., +30%,-10%
Maximum Current Required: 2 Amps @ 12 Volts
PERFORMANCE AND OTHER TECHNICAL DATA
Output Relay
Max. Switching Current:
5 Amps @ 30 Volts D.C.
Rated Carry Current:
10 Amps
Ingress Protection:
IP66 (M-129 Switch assembly only), IP 60 Enclosure
Weight:
1 lbs, (0.45 kg)
Dimensions:
7.29” x 4.34” x 1.85” (186 x 111 x 47mm)
Installation Environment: Protected from weather, code B, IEC60945 (Enclosure Only)
Exposed to weather, code C, IEC60945 (Switch Assembly Only)
