MAN1256-05-EN_EXLW_XLWP_UM
November 10, 2021
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CHAPTER 10: SERIAL COMMUNICATIONS
10.1 Overview
All EXLW/XLW PRIME OCS models provide two independent serial ports, on the first 8-pin
modular RJ45 connector, which is labeled MJ1/MJ2. The MJ1 serial port is RS232 while the
MJ2 port is RS485. By default, MJ1 can be connected to the COM port of a PC running Cscape,
for OCS programming. In addition, both MJ1 and MJ2 can be used for application-specific
communication, using a variety of standard data exchange protocols.
The second 8-pin modular RJ45 connector, which is labeled MJ3, provides a multiplexed serial
port, which can be configured for either RS232 or RS485. MJ3 can be optionally set for OCS
programming via the System Menu for connection to the COM port of a PC running Cscape.
10.2 Port Descriptions
The MJ1 serial port contains an RS232 interface with RTS/CTS handshaking. The MJ2 serial port
contains a half-duplex RS485 interface with no handshaking. The MJ3 serial port can be
configured as either RS232 or RS485. The MJ2 and MJ3 RS485 interfaces provide switchable
termination and bias resistors internally, which can be enabled/disabled with DIP switches.
10.3 Wiring and Dip Switches