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Page 15
MASTER
CLOCK
-
1 2 3 4 5 10 11 12 136 7 8 9
TxD RxD
D
+
D
G
N
D
G
N
D
S
Y
N
C
D
+
D
-
D
+
D
-
~
~
RS-232
RS-485
SYNC
OUT
SYNC
IN
12V~
AC
OUT
250ma
MODEM
HOST COMMUNICATIONS
LTR8-512 & LTR8-512M Only
PULSE
SYNC
RS-485
DATA SYNC
+ -
RS-485
DSD
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
RS-485
DSD
+ -
+ -
RS485
The DWA-S comes equipped with an RS485 receiver which can
be used to synchronize the time and date of the unit with other
equipment. The option supplies three leads on the power supply
board for connecting to the sending device. The interconnection
cable between devices should be a minimum of 3 meters long to
prevent interference to radio communications as required by
FCC regulations. Cables less then 3 meters in length require a
Fair-Rite bead (Lathem Part # VII0058) installed around the
cable. The figure below indicates the signal names and
corresponding wire colors.
Signal Wire Color
Receive ( + ) White
Receive ( - ) Yellow
Signal Ground Black
NOTE: Preferred cable is CAT-3 or CAT-5 twisted-pair, up to
4,000 feet in length.
WIRING DIAGRAMS
FIGURE 1: CONNECTION FOR DWA-S TO LTRX-512
NOTE: Since the Sync In port can send as well as receive, 30 extra
devices can connect here. If you already have a Master
Source, such as an LTR-0, connect it and its string of clocks to
the Sync In port, for a total of up to 60 devices.
DWA-S
RS-
485
DSD
Ports are located on the
back of the Display Unit