KEP MMI-1500 Installation & Operation Manual page 210

Case 1: Slave to Master, connecting PLC[RS232] directly to PC[RS-232]/PLC[RS485] combination port.
Connect to SLAVE HMI PLC[RS-232] port
Cable has D-SUB Male end
2 TxD
3 RxD
5 GND
Case 2: Slave to Master, connecting PLC[RS232] to PC side of split download cable (MT5_PC) with use of Male to Male Null
Modem cable.
Connect to SLAVE HMI PLC[RS-232] port
Cable has D-SUB Male end
2 TxD
3 RxD
5 GND
Case 3 Optional Ethernet Connections: Units equipped with the optional Ethernet port can be connected via Ethernet to a
Master and Slaves using standard 10T Ethernet cables. Slave to Master, connect the Ethernet ports with a standard
(Category 5) Ethernet 10T crossover cable (RJ-45 to RJ45). On the other hand, use standard cables with routing passing
through Hubs and Servers as needed.
Connecting a Master directly to a Slave using 10T Crossover cable
Master
Connecting a Master through a Hub to Slaves
Slave
Connect to MASTER HMI PC[RS-232] port
Cable has D-SUB Female end
8 RxD
7 TxD
5 GND
Shield Earth Ground
Connect to MT5_PC to MASTER HMI PC[RS-232] port
Cable has D-SUB Male end
3 RxD
2 TxD
5 GND
Shield Earth Ground
Hub
202
Slave
Slave
Master