MAN0964-14-EN_XL4_XL4P_UM
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CHAPTER 10: SERIAL COMMUNICATIONS
10.1 Overview
All XL4/XL4 Prime OCS models provide two serial ports, which are implemented with single 8-
pin modular RJ45 connectors, are labeled MJ1 and MJ2. The MJ1 serial port is RS-232 while
the MJ2 port is RS-485. MJ1 defaults to OCS programming by connecting it to the COM port of
a PC running Cscape. In addition, both MJ1 and MJ2 can be used for application-specific
communication, using a variety of standard data exchange protocols.
10.2 Port Descriptions
The MJ1 serial port contains a RS-232 interface with RTS/CTS handshaking.
The MJ2 serial port contains half-duplex RS-485 interface with no handshaking. The MJ2 RS-
485 interface provides switchable termination and bias resistors internally.
10.3 Serial Port
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