Klinkmann Unitronics M91 Operation & Settings Manual

M91 RS485 Port Settings

Certain OPLCs can be ordered with an RS485 port. Within the controller, the jumper settings determine the
COM port function according to RS232 or RS485; RS485 termination settings are also determined via jumper.
To check if your controller was supplied with an installed RS485 port, check the device's model number. For
example:
Model Number
All M91 controllers offering a 2-line text display are supplied with an installed RS485 port.
Model Number
Before using this product, it is the responsibility of the user to read and understand this document
and any accompanying documentation.
All examples and diagrams shown herein are intended to aid understanding, and do not guarantee
operation. Unitronics accepts no responsibility for actual use of this product based on these
examples.
Please dispose of this product in accordance with local and national standards and regulations.
Only qualified service personnel should open this device or carry out repairs.
User safety and equipment protection guidelines
This document is intended to aid trained and competent personnel in the installation of this equipment as
defined by the European directives for machinery, low voltage, and EMC. Only a technician or engineer trained
in the local and national electrical standards should perform tasks associated with the device's electrical wiring.
Symbols are used to highlight
information relating to the user's
personal safety and equipment
protection throughout this document.
When these symbols appear, the
associated information must be read
carefully and understood fully.
Failure to comply with appropriate safety guidelines can result in severe personal injury
or property damage. Always exercise proper caution when working with electrical
equipment.
Check the user program before running it.
Do not attempt to use this device with parameters that exceed permissible levels.
Unitronics Industrial Automation
M 9 1 - 1 9 - U N 2
Supplied without
an RS485 port.
M 9 1 - 2 - x x x x
Supplied with
an RS485 port
Symbol
Caution
M 9 1 - 1 9 - 4 U N 2
Supplied with
an RS485 port
Meaning Description
The identified danger causes physical
Danger
and property damage.
The identified danger can cause
Warning
physical and property damage.
Caution Use caution.
1