Wiring RS-485 Time Synchronization Devices

Up to 30 RS-485 Data Synchronization Devices (DSDs) can be connected to the sync ter- minals. 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 must be used as a booster.

RS-485

 

RS-485

 

 

 

RS-485

 

 

 

MASTER

 

 

RS-485

 

 

RS-485

 

DSD

 

DSD

 

DSD

 

DSD

 

DSD

 

CLOCK

+ -

 

+ -

 

+ -

 

+ -

 

+ -

 

+ -

1

 

2

3

4

5

6

7

8

9

10 11 12 13

TxD

G

RxD

D

D

G

S

D

D

D

D ~ ~

 

 

N

 

+

-

N

Y

+

-

+

-

 

 

 

D

 

D

N

12V~

MODEM

 

 

RS-485

SYNC

SYNC

RS-232

 

C

AC

 

 

 

 

 

 

PULSE

OUT

IN

 

HOST COMMUNICATIONS

 

 

OUT

 

SYNC

 

 

 

 

 

 

RS-485

 

250ma

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DATA SYNC

 

PORTS ARE LOCATED ON THE BACK OF THE DISPLAY UNIT

Figure C-8

Synchronizing RS-485 Time Synchronization Devices Without a Buffer

Using the Master Clock as a Slave

Since the SYNC IN port can send as well as receive, 30 extra devices can connect here. If you already have a master source, connect it and its string of clocks to the SYNC IN port for a total of up to 60 devices.

RS-485

 

RS-485

 

 

 

 

 

 

 

 

 

 

RS-485

 

 

 

 

 

 

 

 

 

RS-485

 

 

RS-485

 

 

 

 

 

 

 

 

 

 

 

 

RS-485

DSD

 

DSD

 

DSD

 

 

 

 

 

 

DSD

 

 

 

 

 

 

DSD

 

DSD

+ -

 

+ -

 

+

-

 

 

 

 

+ -

 

 

+ -

+ -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

9

10 11 12 13

 

TxD

G

RxD

D

D

G

S

D

D

D

D ~ ~

 

 

N

 

+

-

N

Y

+

-

+

-

 

 

 

D

 

D

N

12V~

 

 

 

 

 

SYNC

SYNC

MODEM

RS-232

RS-485

 

C

AC

 

 

 

 

 

 

PULSE

OUT

IN

 

 

 

 

 

 

 

 

OUT

HOST COMMUNICATIONS

 

SYNC

 

 

 

 

 

 

RS-485

 

250ma

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DATA SYNC

 

PORTS ARE LOCATED ON THE BACK OF THE DISPLAY UNIT

Figure C-9

Using the Master Clock as a Slave to Allow 30 Extra RS-485 Time Synchronizing Devices

C-6

24A715/24A715M Master Clock Installation Manual