24
CONNECT
O
R
FOR
25-PIN
COM
POR
T
CONNECT
OR
FOR
9-PIN
COM
P
OR
T
TO
AC
OUTLET
TO
CIGARETTE
LIGHTER
(OR)
(OR)
TO
TO
NONE
P
O
W
E
RI
NP
O
LA
R
IT
Y
350MA
(MIN)
13.5VDC
20%
POWER
IN
@
250MA
(MAX)
(POWER
IN)
-(1.5V)
POWER
O
UT
MODEL RS24C
CHESTER,
C
ONNECTICUT
06412-0684
ENGINEERING
C
OMP
ANY
R
POWER
IN
RX
TX
RT
S
GROUND
POWER
O
UT
RS485
(B)
RS485
(A)
GRA
Y
GRA
Y
BLUE
BLUE
+12 VDC (RED)
RED
(+12
VDC)
GRND (BLK)
BLACK (GRND)
NOTE:
The
wires
from
the
Messenger
control
head
are
shown
individually
for
illustration
purposes
only
.
The
actual
wires
are
connected
to
a
common,
6-position
connector
.
*Connect
this
wire
to
a
+12VDC
source
that
is
activated
with
the
vehicle’
s
ignition
switch.
YELLOW
(BACK-LIGHT)*
25-PIN
COM
POR
T
9-PIN
COM
POR
T
HOST
COMPUTER
ON
POS
CLR
DSP
®
THE
TM
SERIES
