LG GLOFA-GM Series, Руководство пользователя, Страница: 282 / 358

Chapter 8 Exercising program
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2) Communication cable connection and basic setting
Connect Cnet with computer communication port in MASTER-K 1000H CPU as shown in [Figure 8.15].
Handshake-free type of null modem connection in RS-232C communication is applied with MASTER-K 1000H
communication type set to RS-232C communication and 9600 BPS/Data 8 bits/Start 1 bit/Stop 1 bit through DIP
switch along with station No. set to station 5. Refer to the user’s manual for MASTER-K series communication to
set MASTER-K 1000H communication.
[Figure 8.15] 3-line connection between Cnet and MASTER-K 1000H (Handshake-free)
Cnet(9-pin) MASTER-K1000 CPU
Pin No. Name
Connection No. and Signal direction
Pin No. Name
1 CD CD 8
2 RXD RXD 3
3 TXD TXD 2
4 DTR DTR 20
5 SG SG 7
6 DSR DSR 6
7 RTS RTS 4
8 CTS CTS 5
9 RI RI 22
3) TX/RX sequence of communication frame
TX/RX procedure to communicate in MASTER-K 1000H computer communication type is as follows. Cnet I/F
module operates as a master station and MASTER-K 1000H operates as a slave to respond to Cnet’s request
as shown in the figure.
[Figure 8.16] TX sequence of TX/RX frames
GLOFA Cnet
User defined master
MASTER-K1000H
Slave station 5
A) Write request frame
B) Response frame