Communications Connections - KEP MMI-7 Series Installation Instruction

4.0 Communications Connections

The ports as you look at the back of the case, are the ports for connecting to a printer, PLC or some
external device (Controller Connectors).
PLC [RS-232] Port
(9 pin D-Female)
4.1 CONNECTION TO A PERSONAL COMPUTER
The 9 Pin, Female, D-SUB, PC [RS-232] & PLC [RS-485] Port on the back of the unit is the
programming port (PC Connector) and RS485/422 communications port for connecting to a controller.
The Auxiliary (AUX) RS485 port is also accessed through this connector.
Connection
Port Activation
Pin Designations
Pin Symbol
#
1 PLC RxD-
2 PLC RxD+
3 PLC TxD-
4 PLC TxD+
5 GND
6 AUX Data +
7 PC TxD
8 PC RxD
9 AUX Data -
MMI to PC, MT5_PC Cable Configuration
Connect to
Personal Computer
(PC)
RS232 Serial Port
DB9 Female
1 Not used
7 Not used
8 Not used
4 Not used
5 GND
6 Not used
2 TxD
3 RxD
9 Not used
PC [RS-232] &
PLC [RS-485] Port
(9 pin D-Male)
This port can be attached to a Computer via a special DB9 Female to DB9 Female
cable provided with the unit. (KEP P/N: MT5_PC)
This port is activated automatically by the PC during: On line simulation,
Download and Upload activities.
The Programmer Port cannot simulate, download or upload to the MMI while it is
on line with the controller at the same time. The MMI must be put into "RDS"
mode with the EasyManager applet first.
Pin assignment of the 9 Pin, Male, D-SUB PC [RS-232] & PLC [RS-485]
Port
PLC[RS485] PLC[RS485]
2 Wire 4 Wire
Transmit/ RS485 Receive
Receive -
Transmit/ RS485 Receive
Receive +
RS485 Transmit
RS485 Transmit
Signal Ground Signal Ground
Connect to
MMI (HMI)
RS232/485 [PLC]
DB9 Female
1 RX-
2 RX+
3 TX-
4 TX+
5 GND
6 AUX Data +
7 TxD
8 RxD
9 AUX Data -
AUX[RS485]
2 Wire
Signal Ground
Transmit/
Receive +
Transmit/
Receive -
Connect to
Controller
RS485 Port
DB9 Male
1 RX-
2 RX+
3 TX-
4 TX+
5 GND
6 AUX RS485+
7 Not used
8 Not used
9 AUX RS485-
6
Ethernet Port
(RJ-45 Male)
(Not Available on
MMI-720 units)
PC[RS232]
Signal Ground
RS232 Transmit
RS232 Receive
PC
PLC
HM
RS485