13.07.2006
V.1.5
USER MANUAL for
RS-232 to RS-485 converter module
type: PMT-2/4-Z45
firmware version:
1.0
or higher
Read the user's manual carefully before starting to use the unit.
Producer reserves the right to implement changes without prior notice.
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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CONTENTS
1. BASIC REQUIREMENTS AND USER SAFETY ....................................................................................... 3
2. GENERAL CHARACTERISTICS.............................................................................................................. 4
3. TECHNICAL DATA .................................................................................................................................. 4
4. DEVICE INSTALLATION ......................................................................................................................... 5
4.1. UNPACKING ................................................................................................................................. 5
4.2. CONNECTION METHOD ............................................................................................................... 5
4.3. MAINTENANCE ............................................................................................................................. 8
5. PREPARATION OF THE UNIT TO WORK ............................................................................................... 8
6. CONNECTION OF THE UNIT WITH TRS SYSTEM ............................................................................... 10
Explanation of symbols used in the manual:
- This symbol denotes especially important guidelines concerning the installation and
operation of the device. Not complying with the guidelines denoted by this symbol
may cause an accident, damage or equipment destruction.
IF THE DEVICE IS NOT USED ACCORDING TO THE MANUAL THE USER IS
RESPONSIBLE FOR POSSIBLE DAMAGES.
- This symbol denotes especially important characteristics of the unit. Read any
information regarding this symbol carefully
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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1. BASIC REQUIREMENTS AND USER SAFETY
- The manufacturer is not responsible for any damages caused by
inappropriate installation, not maintaining the proper technical condition and
using the unit against its destination.
- Installation should be conducted by qualified personnel. During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- The unit must be properly set-up, according to the application. Incorrect
configuration can cause defective operation, which can lead to unit damage or an
accident.
- If in the case of a defect of unit operation there is a risk of a serious threat to
the safety of people or property additional, independent systems and
solutions to prevent such a threat must be used.
- Neighbouring and mating equipment must meet the requirements of appropriate
standards and regulations concerning safety and be equipped with adequate antiovervoltage and anti-interference filters.
- Do not attempt to disassemble, repair or modify the unit yourself. The unit
has no user serviceable parts. Units, in which a defect was stated must be
disconnected and submitted for repairs at an authorized service centre.
- In order to minimize fire or electric shock hazard, the unit must be protected
against atmospheric precipitation and excessive humidity.
- Do not use the unit in areas threatened with excessive shocks, vibrations, dust,
humidity, corrosive gasses and oils.
- Do not use the unit in explosion hazard areas.
- Do not use the unit in areas with significant temperature variations, exposed to
condensation or icing.
- Do not use the unit in areas exposed to direct sunlight.
- Make sure that the ambient temperature (e.g. inside the control box) does not
exceed the recommended values. In such cases forced cooling of the unit must be
considered (e.g. by using a ventilator).
The unit is designed for operation in an industrial environment and must not
be used in a household environment or similar.
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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2. GENERAL CHARACTERISTICS
The PMT-2/4-Z45 converter module is designed to interconnect MASTER devices equipped
with RS-232 to RS-485 bus. The module can work either with devices controlling direction of
transmission (via RTS line), or devices not controlling the direction (control is then fully
automatic). The MASTER functions can be realized by any device, e.g. PC computer with
dedicated software. Connection of more than one MASTER device to the RS-485 bus is
prohibited.
The PMT-2/4-Z45 unit guarantees full galvanic insulation between RS-232 and RS-485 circuits.
Warning - only one PMT-2/4-Z45 can be connected to RS-485 line.
The converter can work with any devices equipped with RS-485 interface, especially made by
BD|SIMEX.
The main purpose of PMT-2/4-Z45 converter is connection of PC host computer with industrial
data acquisition and visualisation systems based on RS-485 interface.
The device is equipped with RS-232 cable which should not be prolonged (due to
limitations of the RS-232 interface standard)
3. TECHNICAL DATA
Power supply voltage 9 ÷ 30 VDC
Power consumption max. 1.6 W
Galvanic separation between RS-485 line and RS-232 interface
RS-232 connector 1x 9 PIN Canon (RS-232), cable (length about 1.3 m) is
delivered with the unit
Transmission parameters 2400 ÷ 115200/8/1/N (without direction control by RTS)
1200 ÷ 115200/8/1/N (with direction control by RTS)
Delay to transmitter switch off typical 1.5 character (do not apply controlling by RTS)
Housing dimensions 40 x 55 x 100 mm
Weight 170 g
Operating temperature 0 °C to +50 °C
Storage temperature -10 °C to +70 °C
Humidity 5 to 90 % no condensation
Altitude up to 2000 meters above sea level
Screws tightening max. torque 0.5 Nm
Max. connection leads diameter 2.5 mm
2
EMC PN-EN 61326:2003
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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This is a class A unit. In housing or a similar area it can cause radio frequency
interference. In such cases the user can be requested to use appropriate
preventive measures.
4. DEVICE INSTALLATION
The unit has been designed and manufactured in a way assuring a high level of user safety and
resistance to interference occurring in a typical industrial environment. In order to take full
advantage of these characteristics installation of the unit must be conducted correctly and
according to the local regulations.
- Read the basic safety requirements on page 3 prior to starting the installation.
- All installation works must be conducted with a disconnected power supply.
- Protecting the power supply clamps against unauthorized persons must be taken
into consideration.
4.1. UNPACKING
After removing the unit from the protective packaging, check for transportation damage. Any
transportation damage must be immediately reported to the carrier. Also, write down the unit
serial number on the housing and report the damage to the manufacturer.
Attached with the unit please find:
- warranty
- user’s manual for PMT-2/4-Z45 unit (device)
4.2. CONNECTION METHOD
Caution
- Installation should be conducted by qualified personnel. During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- Wiring must meet appropriate standards and local regulations and laws.
- In order to secure against accidental short circuit the connection cables must be
terminated with appropriate insulated cable tips.
- Tighten the clamping screws. The recommended tightening torque is 0.5 Nm.
Loose screws can cause fire or defective operation. Over tightening can lead to
damaging the connections inside the units and breaking the thread.
- In the case of the unit being fitted with separable clamps they should be inserted
into appropriate connectors in the unit, even if they are not used for any
connections.
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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Due to possible significant interference in industrial installations appropriate measures
assuring correct operation of the unit must be applied. To avoid the unit of improper
indications keep recommendations listed below.
- Avoid common (parallel) leading of signal cables and transmission cables together
with power supply cables and cables controlling induction loads (e.g. contactors).
Such cables should cross at a right angle.
- Contactor coils and induction loads should be equipped with anti-interference
protection systems, e.g. RC-type.
- Use of screened signal cables is recommended. Signal cable screens should
be connected to the earthing only at one of the ends of the screened cable.
- In the case of magnetically induced interference the use of twisted couples of signal
cables (so-called “spirals”) is recommended. The spiral (best if shielded) must be
used with RS-485 serial transmission connections.
- In the case of interference from the power supply side the use of appropriate antiinterference filters is recommended. Bear in mind that the connection between the
filter and the unit should be as short as possible and the metal housing of the filter
must be connected to the earthing with largest possible surface. The cables
connected to the filter output must not run in parallel with cables with interference
(e.g. circuits controlling relays or contactors).
The connections should be made accordingly to sticker on the top of converter's housing
(Figure 4.1 - 4.2).
Figure 4.1. Method of cable insulation replacing and cable terminals
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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Push-button and LEDs functions:
LED pwr (green) - power on (lights constantly)
- programming mode (flashes)
LED pd2 (yellow) - turning on the RS-485 transmitter (while normal operation)
- current configuration (while programming mode)
LED pd1 (red) - data transmission to RS-485 interface (while normal operation)
- current configuration (while programming mode)
LED pd0 (green) - data receiving from RS-485 interface (while normal operation)
- current configuration (while programming mode)
prg button - programming button
Figure 4.2 Connection method
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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4.3. MAINTENANCE
The unit does not have any internal replaceable or adjustable components available to the user.
Pay attention to the ambient temperature in the room where the unit is operating. Excessively
high temperatures cause faster ageing of the internal components and shorten the fault-free
time of unit operation.
In cases where the unit gets dirty do not clean with solvents. For cleaning use warm water with
small amount of detergent or in the case of more significant contamination ethyl or isopropyl
alcohol.
Using any other agents can cause permanent damage to the housing.
Product marked with this symbol should not be placed in municipal waste. Please
check local regulations for disposal and electronic products.
5. PREPARATION OF THE UNIT TO WORK
The baud rate of the PMT-2/4-Z45 converter is defined while programming mode. It is possible
to set baud rate from 2400 baud to 115200 baud (Tab. 5.1) or enable control of the
transmission's direction by MASTER via RTS line. Controlling of the direction by MASTER
allows transmitting data with baud rate 1200 to 115200 baud.
The programming of the device is realized using prg button, available from the bottom of the
device. Due to the button is mounted inside the device, use slim tool to press it (e.g. small
screwdriver or match).
While programming, it is recommended to disconnect the device from RS-232
socket, to avoid of erratic identification of the programmed mode.
To program the device, following steps should be done:
1. connect power supply (24 VDC) to the converter terminals marked +Us and GND. The
green led pwr will light constantly;
2. press and hold at least 4 seconds the prg button. Led pwr will start flashing, signalising
that programming mode is enabled. The rest of LEDs (pd2, pd1, pd0) will indicate current
configuration (Tab. 5.1);
3. press (short) programming button – configuration will change, LEDs pd2, pd1, pd0 will
indicate new states. Press the button as much as required to set desired configuration
(Tab. 5.1);
4. press and hold at least 4 seconds the prg button. Led pwr will stop flashing, and signalise
storing of the configuration and normal operation mode.
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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LEDs state
(1 - lights, 0 - dimmed)
baud rate
[baud]
pd2 pd1 pd0
0 0 0 Selected by MASTER using RTS line
0 0 1 2400
0 1 0 4800
0 1 1 9600
1 0 0 19200
1 0 1 38400
1 1 0 57600
1 1 1 115200
Tab. 5.1 Signalisation of the device's configuration, by LEDs
pd2, pd1, pd0
Example: Selection of baud rate - 9600 baud.
– press and hold at least 4 seconds the prg button. Led pwr will start flashing, signalising that
programming mode is enabled.
– press (short) programming button few times, until LEDs pd2, pd1, pd0 will indicate the state
0, 1, 1, (where: 1 – led lights, 0 -led dimmed).
– press and hold at least 4 seconds the prg button. Led pwr will stop flashing, and signalise
storing of the configuration and normal operation mode.
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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6. CONNECTION OF THE UNIT WITH TRS SYSTEM
The PMT-2/4-Z45 module is not equipped with internal terminator. If the unit is installed on one
end of RS-485 line external terminator must be installed (Figure 6.1).
The RS-485 line should be equipped with terminators on both it's ends (Figure 6.2), RS-485 line
can't be branched and longer than 1 km.
Figure 6.1 Proffered connection method
Figure 6.2 Accepted connection method
PMT
-
2/4-Z45
PMT
-2/4-Z45
User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
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User manual for RS-232 to RS-485 converter module PMT-2/4-Z45
12
BD
||||
Sensors GmbH
BD-Sensors-Straße 1
95199 Thierstein, Germany
Telefon +49 (0) 9235 / 9811 - 2099
Telefax +49 (0) 9235 / 9811 - 860
e-mail: info@bdsimex.de
www.bdsimex.de
04-2010
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