Yaskawa MP940 - Manual (Page 99)

MP940 Functions
4.2.1 Overview
4-6
4.2 Serial Communications Function
4.2.1 Overview
The MP940 provides one serial communications interface for RS-232C and another for RS-422/
485. Each interface can handle a variety of communications protocols, including the Yaskawa
MEMOBUS communications protocol. The RS-232C interface at port 1 can also be used as an
engineering port, making it possible to connect a CP-717 for MP940 programming and monitor-
ing.
The MP940 will operate as either a master or slave, depending on the protocol set for serial
communications.
With serial communications, data is sent and received using MSG-SND and MSG-RCV func-
tions in a DWG/function program.
4.2.2 System Configuration
„ Standard System Configuration
In this example, a CP-717 Programming Device and a display panel are connected to an
MP940 SERIAL Module.
BAT
RDY
RUN
ALM
BAT
PRT1
6
5
4
3
2
1
NO →
PRT2
RUN
INIT
TEST
FLASH
PP
COPY
PORT1
PORT2
POWER
+24V
GND
FG
LED
I/O
TX
R
X
1
2
M
E
C
H
A
T
R
O
L
I
N
K
MP940
PORT1
RS-232C
PORT2
RS-422/485
PORT2
PORT1
RS-422/
485
RS-232C
Communica-
tions CPU
Communica-
tions proces-
sor 1
Communica-
tions proces-
sor 2
CP-717
MP940
RS-422
RS-232C
Display panel
Notebook computer
MP940
CP-717
RS-232C
RS-422