MM-015371-001, Rev. C
61
P3, the cable’s 6-pin connector, is a connector for basics accessories (e.g., hookswitch, etc.).
P4, the cable’s 25-pin D-subminiature (DB-25) connector, provides audio and data connections for
connections to optional equipment.
P5, the cable’s 9-pin D-subminiature (DB-9) connector, is not used in motorcycle applications of the
radio. In standard mobile applications of the radio, this connector provides NMEA-formatted GPS serial
data connections for the external computer processing the NMEA-formatted GPS data received by the
radio’s internal GPS receiver.
Table 13-1: M5300/M7300 Option Cable CA-012349-001 Interconnections
44-PIN I/O
CABLE
CONNECTOR
P1 PIN
SIGNAL NAME
TO/FROM
DESCRIPTION
19 SPKR1
20 SPKR1
P2 pin 1
21 SPKR2
22 SPKR2
P2 pin 2
Speaker Audio Outputs 1 and 2. These speaker outputs are
not used in a motorcycle installation, since the audio amplifier
in the CH-721 control head drives the external speaker.
10
OUT2
P3 pin 1
Digital Output 2 (open-collector).
7
GND
P3 pins 2 & 4 Chassis Ground (fused on radio’s PK Board at 3.15 amps).
26
HKSW
P3 pin 3
Hookswitch Digital Input. Active = Ground. Inactive = Open.
25
INP2
P3 pin 5
Digital Input 2.
28
SWA+
P3 pin 6
Switched A+ (DC Power) Output.
8
GND
P4 pin 1
Chassis ground (fused on PK Board at 3-amps).
30
DGPS_DATA
P4 pin 4
GPS Serial Data. This connection is not used in a motorcycle
installation.
4
EXTRX
P4 pin 5
External Rx Audio Output. This connection is not used in a
motorcycle installation.
9
EXTMOD
P4 pin 7
External Tx Audio Input. This connection is not used in a
motorcycle installation.
3
SDATA
P4 pin 8
In a motorcycle installation (i.e., remote-mount radio), this pin
on the radio’s DB-44 connector is not functional. For siren/PA
interfacing, use the respective pins on the CH-721 Option
Cable’s female DB-25 connector. See Section 13.5 for
additional information.
5
FDISC
P4 pin 9
Buffered Discriminator Audio. This connection is not used in a
motorcycle installation.
13
ALO
P4 pin 10
Audio Ground/Reference (fused on radio’s PK Board at
3.15 amps).
12
MICHI
P4 pin 11
1
EXTALO
P4 pin 12
In a motorcycle installation (i.e., remote-mount radio), this
MICHI input is not functional. For siren/PA interfacing, use
the respective pins on the CH-721 Option Cable’s female
DB-25 connector. See Section 13.5 for additional information.
14
VOLHI
P4 pin 13
Volume High. This connection is not used in a motorcycle
installation.
15
CTLON
P4 pin 14
Control On Digital Output.
