MAN0878-09-EN_XLE_XLT_UserManual
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CHAPTER 5: SERIAL COMMUNICATIONS
5.1
Overview
All XLE/XLT models provide two serial ports, which are implemented with 8-pin modular RJ45
connectors and are labeled MJ1 and MJ2. The MJ1 serial port is normally used for XLE/XLT
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.
5.2
Port Descriptions
The MJ1 serial port contains both a half-duplex RS-485 interface and an RS-232 interface with
RTS/CTS handshaking.
NOTE: MJ1 shares its serial port with the optional COM module, so when an optional Modem
COM or other module is installed and active, the MJ1 connector is inactive.
The MJ2 serial port contains both a full-duplex RS-485 interface and an RS-232 interface with
no handshaking. Both the MJ1 and MJ2 RS-485 interfaces provide switchable termination and
bias resistors internally. Also, both MJ1 and MJ2 can be set as the serial programming port.