Mitsubishi Electric AJ71C24-S6 User Manual page 33

2. SYSTEM CONFIGURATIONS
MELSEC-A
2)
Functions available when using PC CPUs
Interfaces for Dedicated
Available Functions
RS-422 RS-232C
1 : Data communications is possible only with the system which has a 1 : 1
configuration
(one
external device to one PC CPU,
as
shown in Fig. 2.5)
(b) Interfaces used to set the no-protocol mode
Functions available when using external devices and PC CPUs
On-demand
I
Interfaces for Dedicated
Available Functions
Protocol
RS-422 RS-232C
Data transmis-
sion to external
devices
I
Send
PC CPU to
1
exiernai
1
o
I
011
devices
o * l
Note
o * l
Receive
To computers.
printers, and
CRTs.
From computers
and keyboards
-
External device
to PC CPU
0 O * l
*
1 : if fuii-duplex transmission is possible with the external device, data com-
munications in the no-protocol mode is possible with the system which has
the 1 :
n
configuration.(external d e v i c e 2 to PC CPUs, as shown in Fig. 2.5).
(c) Interface used to set the bidirectional mode
Functions available when using external devices and PC CPUs
*
1 : Data communications is possible only with the system which has
a
1 : 1
configuration (external device-1 to one PC CPU, as shown in Fig. 2.5).
Available Functions
Send
Receive
Note
To computers
From computers
lnterfaces for Dedicated
Protocol
PC CPU to
computer
Computer to
PC CPU
RS-422
o* 1
0'1
RS-232C
o * l
0' 1