MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
Page 112 | 199
CHAPTER 10:
SERIAL COMMUNICATIONS
10.1 Overview
All XL7/XL7 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
Figure 10.1
–
Serial Ports