Chapter 9 Data Link; Description For Data Link Function - Sharp JW-20CM User Manual

Chapter 9 Data Link

9-1 Description for data link function

· The data link function us used to send and receive ON/OFF signals (relay link: max. 2048 points) and
numerical data (register link : max. 2048 bytes) by PCs or between PC and personal computers connected
in the satellite net system.
· The master station and slave stations are connected using a single coaxial cable. As the JW-20CM
network module can control the data communications, the PC does not need any special programming.
· When the JW-20CM is assigned as a slave station, it has the standard function and memory capacity
save function for data link. But the data contents for receiving from other stations is different between
these two functions. (When the JW-20CM is used as a master station, only the standard function is
available.)
[When all of a master station and slave stations are JW-20CM]
• Master station
• Slave station
· A maximum of 6 modules (a mixed installation of master and slave stations is allowed) can be installed
on one PC.
· A maximum of 64 stations can transfer data on one network with maximum cable length of 1 km.
Master station 00
(8)
Network module
(JW-20CM)
PC
· Both JW and ZW model PCs can be connected on the same cable.
Data link (Standard function)
Data link (Standard function)
Data link
(Memory capacity save function)
Personal computer
slave station 02
Slave station 01
(8)
Network module
(JW-20CM)
PC
Network module
(64 stations max., Total extension length: 1km max.)
Slave station 01
Slave station 02
(8)
Network module
Network module
(JW-20CM)
JW20 (JW-22CM)
JW20H
JW30H
(64 stations max., Total extension length: 1km max.)
9
Receiving data are all relay link area, and
｝
all register link area of all stations.
In order to effectively use the memory,
unify a partial data area or sending/
receiving address (program) of slave
stations.
(8) Slave station 77
Network module
(ZW-20CM)
PC
Slave station 76
(8)
(8)
Network module
(ZW-20CM)
1
·
(8)
Slave station 77
(8)
Network module
(JW-20CM)
9