Fig. D5 - Synching Up To 60 Rs-485 Time Sync Devices; Fig. D6 - Ltrx-512 Used As Slave To Allow 30 Extra Rs-485 - Lathem LTR-512 Installer's Manual

Fig. D5 - SYNCHING UP TO 60 RS-485 TIME SYNC DEVICES

RS-485
RS-485
DSD DSD
+ -
+ -
MODEM
HOST COMMUNICATIONS
LTR8-512 & LTR8-512M Only
Notes: Up to 30 RS-485 Data Sync Devices (DSDs) can be connected to the Data Sync port. Since the SYNC IN
port can send as well as receive, 30 extra devices can be connected. If more than 60 DSDs are to be
connected, another Master Clock will have to be used as a "Booster".

Fig. D6 - LTRx-512 USED AS SLAVE TO ALLOW 30 EXTRA RS-485

RS-485
RS-485
DSD
DSD
+ - + -
MODEM
HOST COMMUNICATIONS
LTR8-512 & LTR8-512M Only
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.
LTRx-512 Installer's Guide
WITHOUT A BUFFER
RS-485
DSD
+ -
1 2 3 4 5 6
D
TxD RxD D
G
G
N
N
+
-
D
D
RS-232
RS-485
PULSE
SYNC
TIME SYNC DEVICES
RS-485
DSD
+ -
1 2 3 4 5 6
D
TxD G RxD D
G
N
N
+ -
D
D
RS-232 RS-485
PULSE
SYNC
RS-485
DSD
+ -
7 8 9 10 11 12 13
D D D
D ~ ~
S
~
Y
+ - + -
N 12V~
SYNC SYNC
C
AC
OUT IN
OUT
RS-485
250ma
DATA SYNC
RS-485
DSD
+ -
7 8 9 10 11 12 13
D D D
S D ~
Y
+ - + -
N 12V~
C SYNC SYNC
AC
OUT IN
OUT
RS-485
250ma
DATA SYNC
45
Wiring Diagrams
RS-485
DSD
+ -
Ports are located on the
back of the Display Unit
RS-485
DSD
+ -
Ports are located on the
~ back of the Display Unit
RS-485
DSD
+ -
MASTER
CLOCK
+ -