Installation Instructions Part 2

Table 2 - Radio Option Connector P3 Interface Description Cont’d

DB-25

Pin No

(J100)

Pin No

(P3)

I/O Description

24 15 O

(1) HORN CONTROL At Signaling Mode

Display In Menu Action

On Enable

Off Disable

# When select “ON”(enable) and a correct T99 Individual

Call is received, the output of pin 15 is “low.”

# Horn Alarm ON : Low

Horn Alarm OFF: Open

(2) SPEAKER SELECT INTERNAL/EXTERNAL

# Enabling or disabling of the Internal/External Speaker

option is done by proper setting of an internal jumper in

the mobile radio.

# Internal: Low

# External: Open

# For relay control Io_max = 150mA

# **“HORN CONTROL” or “SPEAKER SELECT” is

selected by PC ProGrammer.

Note: Internal and external speaker do not operate

simultaneously.

12 16 I

Data Communication Input (Test Mode)

# TTL Level

25 17 O

Data Communication Output (Test Mode)

TTL Level

13 18 I

Ignition Sense

# 13.6VDC

Io_max = 100 mA

Internal Mic Mute (DB25-10) must be grounded when applying

audio to external Mic Input (DB25-19).

External Mic Input (DB25-19) has the same audio characteristics

as the Front Panel Mic Jack. External Mod Input (DB25-7) has

no pre-emphasis or modulation limiting.

NOTE