LG GLOFA-GM Series User Manual page 282

Chapter 8 Exercising program
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)
Pin No.
1
2
3
4
5
6
7
8
9
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
Connection No. and Signal direction
Name
CD
RXD
TXD
DTR
SG
DSR
RTS
CTS
RI
A) Write request frame
B) Response frame
8-31
MASTER-K1000 CPU
Pin No. Name
CD 8
RXD 3
TXD 2
DTR 20
SG 7
DSR 6
RTS 4
CTS 5
RI 22