MAN0974-13.1-EN_XL7_UM
August 19, 2021
Page 112 | 198
CHAPTER 10: SERIAL COMMUNICATIONS
10.1 Overview
All XL7 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
Figure 10.1
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Serial Ports