Klinkmann Unitronics M91 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 M91-19-UN2
Supplied without
an RS485 port.
M91-19-4UN2
Supplied with
an RS485 port
All M91 controllers offering a 2-line text display are supplied with an installed RS485 port.
Model Number M91-2-xxxx
Supplied with
an RS485 port
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.
Symbol Meaning Description
Danger The identified danger causes physical
and property damage.
Warning The identified danger can cause
physical and property damage.
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. Caution Caution Use caution.
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.
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M91 RS485 Port Settings 12/03
RS485
Use RS485 to create a multi-drop network containing up to 32 devices.
RS485 Pinout
Diagram Pin Number Function
1 A signal (+)
2 (RS232 signal)
3 (RS232 signal)
4 (RS232 signal)
5 (RS232 signal)
6 B signal (-)
Note that when a port is set to RS485, both RS232 and RS485 can be used simultaneously if flow control
signals DTR and DSR are not used.
Note that the ports are not isolated. If the controller is used with a non-isolated
external device, avoid potential voltage that exceeds ± 10V.
To avoid damaging the system, all non-isolated device ports should relate to the
same ground signal
Caution Use shielded, twisted pair cables.
Minimize the stub (drop) length leading from each device to the bus.
Ideally, the main cable should be run in and out of the network device.
Do not cross positive (A) and negative (B) signals.
Positive terminals must be wired to positive, and negative terminals to negative.
#1
Settings
The jumper settings shown below determine whether the controller functions according to RS232 or RS485, and
whether it will serve as an end device in a RS485 network. Note that the factory default setting is ON. If the
OPLC is not a network end device, set both jumpers to OFF.
RS232/RS485 Jumper Settings
The tables below show how to set a specific jumper to change the functionality of the controller.
To open the controller and access the jumpers, refer to the instructions on the next page.
To use as: JP1 JP2
RS232* A A
RS232/RS485
Jumper Settings
RS485 B B
Termination JP3 JP4
ON* A A
RS485 Termination
Settings
OFF B B
*Default factory setting
2 Unitronics Industrial Automation

M91 RS485 Port Settings
.
Opening the Controller
Before opening the controller, touch a grounded object to discharge any
electrostatic charge.
Avoid touching the PCB board directly by holding the PCB board by its connectors.
Figure 1. Opening the Controller
1. Turn power off before opening the
controller.
2. Locate the 4 slots on the sides of the
controller.
3. Using the blade of a flat-bladed
screwdriver, gently pry off the back of the
controller as shown in Figure 1.
Figure 2. Removing the Top PCB board
4. Gently remove the top PCB board:
a. Use one hand to hold the top-most
PCB board by its top and bottom
connectors as shown in Figure 2.
b. With the other hand, grasp the
controller, while keeping hold of
the serial ports; this will keep the
bottom board from being removed
together with the top board.
c. Steadily pull the top board off.
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M91 RS485 Port Settings 12/03
Figure 3. RS232/RS485 Jumpers, Factory Default Settings
5. Locate the jumpers shown in
Figure 3, then change the
jumper settings as required.
Figure 4. Replacing the Board
6. Gently replace the PCB board
as shown in Figure 4. Make
certain that the pins fit correctly
into their matching receptacle.
a. Do not force the board
into place; doing so
may damage the
controller.
7. Close the controller by
snapping the plastic cover back
in its place. If the card is
placed correctly, the cover will
snap on easily.
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