MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
58
January 2000
The Horn Alert interface is a 24AWG wire that is connected to Pin 4 of the Power Supply
connector. This lead is capable of sinking 2A of 12VDC current. The operational state of this
lead is either open or ground.
A toggle switch is shown for easy deactivation before driving instead of a more complicated
function call via the handset. Mitsubishi recommends using a Bosh Relay part number 0-332-
019-150 (Tessco part number 79246) Single Pole, single throw horn relay (12V, 30A inductive
load) and the Celldyne Relay Socket part number RH2 (Tessco part number 44084) Pre-Wired
Socket (includes 3 14 AWG and 2 18 AWG 24” (61cm) leads or equivalents. Tessco’s phone
number is 1-800-472-7373 (USA, Canada, Mexico) or 1-410-229-1200. Note that Mitsubishi
does not warrant horn alert or any accessories not provided by Mitsubishi.
There is a two-ring delay before the horn alert lead is active.
7.0 Programming & Commissioning
7.1 General Process and Procedures
Before operating a MT, the user must register it with the MSAT system and manually initialize
it. This process requires coordination with the MSAT service provider to receive the required
programming information, based on customer account activation or reactivation.
The manual initialization procedure only needs to be conducted once for a new MT account (not
every time the customer uses the MT). The MT may also have to be re-initialized due to certain
changes in their service account or due to deactivation from the MSAT CGS.
For a complete checklist of steps required for initialization and quick reference procedures, see
Appendix B.
