Lathem LTR-512 - Manual (Page 49)

LTRx-512 Installer’s Guide
Wiring Diagrams
45
Fig. D5 - SYNCHING UP TO 60 RS-485 TIME SYNC DEVICES
WITHOUT A BUFFER
-
1 2 3 4 5 10 11 12 13 6 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
RS-485
DSD
+ - + - + - + - + - + -
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
TIME SYNC DEVICES
MASTER
CLOCK
-
1 2 3 4 5 10 11 12 13 6 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
+ - + -
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.
Ports are located on the
back of the Display Unit
Ports are located on the
back of the Display Unit