Relay PW250 User manual

User Manual
PW250
M-Bus Converter and Repeater for 250 Slaves
Bedienungsanleitung

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Table of contents
1. Main Features ...........................................................................................................................................3
2. Installation.................................................................................................................................................3
2.1 Mounting.............................................................................................................................................3
2.2 Connectors in the terminal compartment ...........................................................................................4
2.3 Interfaces at the housing ....................................................................................................................4
2.4 LED indicators ....................................................................................................................................5
3. Description of functions.............................................................................................................................6
3.1 Interface multiplexer / switch ..............................................................................................................6
3.2 RS232C interfaces .............................................................................................................................6
3.3 RS485 interface..................................................................................................................................7
3.4 Repeater interface ..............................................................................................................................7
3.5 USB interface .....................................................................................................................................8
3.6 Ethernet interface ...............................................................................................................................9
3.6.1 IT preparations ............................................................................................................................9
3.6.2 Software installation..................................................................................................................10
3.6.3 Setup of the device server...................................................................................................11
3.6.4 Setup of the virtual port.............................................................................................................13
4. Technical data.........................................................................................................................................15
4.1 General data.....................................................................................................................................15
4.2 Interface data....................................................................................................................................16
4.3 Ordering information.........................................................................................................................16
© Relay GmbH 2019
www.relay.de

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1. Main Features
-M-Bus Level Converter for 250 devices
-Transparent level converting of several interfaces to M-Bus
-Ethernet 10/100BaseT and USB 2.0 with driver for virtual serial port
-1 x RS232C with terminals (TXD, RXD, GND) and 1 x RS232C with DSUB socket
-2-wire RS485 interface (not addressable)
-M-Bus Booster with Repeater function for extension of M-Bus networks
-Galvanic isolation of all interfaces from M-Bus
-Intelligent access control of the interfaces by a microcontroller
-Internal power supply with wide range input for worldwide use
-Housing for wall mounting (optional rail mounting kit)
2. Installation
2.1 Mounting
The case of the PW250 can be attached to a wall with four screws. The drill pattern is rectangular (180 mm
horizontal, 180 mm vertical). The drillings shall have a diameter of 5 mm. You can alternatively fix a special
rail holder to the case to enable the mounting on a rail of the type TS 35 (Accessory: GHZ TSH35-2). The
case can be secure closed with the optional cylinder lock (accessory: GHZ Lock).
180 mm
180 mm
Holes Ø = 5mm

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2.2 Connectors in the terminal compartment
PE / PE
Protective conductor (earth)
L / N
Main power supply 110VAC to 240 VAC, to be connected only by electricians
M-Bus + -
M-Bus output, wires to the M-Bus meters, 3 pairs of parallel connections
M-Bus IN Repeater
M-Bus Repeater input for network extension
RS485 A B
RS485 interface, 2-wire, A = + / B = -
RS485 Term
Terminator for RS485 interface, jumper placed (default) = 120 Ω
RS232 RX,TX,GND
RS232C interface, RX = PC receives data, TX = PC transmits data, GND
Attention: When laying the cables in the terminal compartment, please take care that the light pipes are not
blocked by cables after closing the housing cover.
2.3 Interfaces at the housing
Ethernet RS232C USB Cable glands
Ethernet 10/100MBit RJ45 Ethernet socket for network connection
RS232 RS232C D-SUB9 socket
USB Device USB connector of the internal USB-to-RS232 converter (FTDI).
Cable glands for power supply, M-Bus, RS232C, RS485 and M-Bus IN
-
+

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2.4 LED indicators
There are in total six LEDs in the front part showing the status of the M-Bus. A lighted LED has the following
meaning:
POWER The M-Bus output voltage is switched on.
TRANSMITTING The Master sends data.
RECEIVING Minimum one meter replies with data.
MAX CURRENT The maximum number of connectable meters is exceeded (warning).
SHORT CIRCUIT M-Bus over current / short circuit (2 Hz flashing)
M-Bus ACTIVE One interface is active and exclusively occupies the M-Bus.
Two LEDs in the RJ45 Ethernet socket show the state of the network and the virtual comport. The LEDs have
a reduced intensity of 20% of the normal value without a connected network cable. Once a network is
connected, the brightness changes to 100%. The most important flash patterns have the following meaning:
You can find all other patterns in the online help of the DS Manager (F1-button) in the chapter “Firmware
Manuals / Device Server Application Firmware / Status LED Signals (Red = Green / Green = Yellow).
No connection established
A connection is active
A connection is established and a
communication is active
Device Server performs a restart

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3. Description of functions
The PW250 is a transparent Level Converter from several interfaces to M-Bus for up to 250 meters. The
device allows external connected controllers such as a building control, a DDC or a PC to read the connected
meters by use of an M-Bus software (not in scope of delivery). The PW250 can also be used as a Repeater
for extension of M-Bus networks relating to the cable length and number of meters.
3.1 Interface multiplexer / switch
An internal microcontroller handles the bus control to just give one interface access to the M-Bus even with
multiple connected interfaces. This ensures that systems do not interfere with each other during the
communication, when two or more systems are connected, for example a BMS via RS485 and a PC via USB.
This automatic switch operates on the principle "first come, first served", i.e. when an interface sends a signal
to the M-Bus, this interface takes control of the M-Bus and has exclusive access to communication. The
“ACTIVE” labeled LED indicates the activity status of the internal interface switch. While the LED is lit, one of
the six possible interfaces is active. The other interfaces are disabled at this time and cannot access the M-
Bus. The active interface remains enabled about 3 seconds after the last communication. Another interface
can occupy the M-Bus as soon as the LED goes off.
3.2 RS232C interfaces
The PW250 has two independent RS232C interfaces, one of them as a 9-pin D-SUB socket in the case front
and the other as a 3-pin screw terminal in the terminal compartment. The RS232C pins assignments are:
RX = PC transmits to M-Bus, TX = PC receives from M-Bus, GND = Signal ground
The pin assignments of the D-SUB socket (female) are designed so that for connection to a PC a simple 9-
pin extension cable (male / female with 1: 1 connection) can be used.
Pin 1
DCD (data carrier detect)
Unused
Pin 2
RXD (PC receives data)
M-Bus transmits data to PC
Pin 3
TXD (PC transmits data)
PC transmits data to M-Bus
Pin 4
DTR (data terminal ready)
Bridged to Pin 6 (DSR)
Pin 5
GND (Signal ground)
GND
Pin 6
DSR (date set ready)
Bridged to Pin 4 (DTR)
Pin 7
RTS (request to send)
Bridged to Pin 8 (CTS)
Pin 8
CTS (clear to send)
Bridged to Pin 7 (RTS)
Pin 9
RI (ring indicator)
Unused

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3.3 RS485 interface
A 2-wire RS485 interface will be connected to the RS485 terminals (A = + and B = -) in the terminal
compartment. Please note that this is a transparent interface without addressing on the RS485 bus. The
direction control of the half-duplex 2-wire connection is realized that the PW250 is passive in the idle state
(receiver on, transmitter off) and becomes on transmitted data from M-Bus meters (receiver off, transmitter
on). The level converter remains active on the RS485 for approximately 50ms after the last transmitted space
(0-Bit) of the slave. The master software should not start a new request to the connected meters during this
period.
The RS485 bus is terminated at the factory with a 120Ω resistor. This can be disabled if necessary by removing
the jumper "RS485 TERM" on the board in the terminal compartment. The terminating resistor is designed for
permanent overvoltage up to a value of 7 VDC on the RS485 bus. If a higher overvoltage protection is required,
the jumper should be removed and a proper dimensioned external resistor be connected between terminals
A and B.
3.4 Repeater interface
The PW250 can be used as a so-called Repeater, as a network extension for existing M-Bus systems, if the
maximum number of meters or the maximum cable length has been exceeded for the installation. Up to 250
devices and up to 4km cable (1 x 2 x 0.8 JYSTY) at 2400 baud transmission speed can be connected to a
repeater.
The M-Bus line of the existing master or level converter is connected to the terminals labeled with M-Bus IN
(Repeater). The polarity does not matter - as usable and standardized for M-Bus slaves. The signal at the
M-Bus output of the PW250 is reconditioned to connect a complete M-Bus network. An almost unlimited
number of repeaters can be cascaded or connected in parallel due to the automatic measurement of the
maximum transmission speed and the recovery of bit times (bit recovery) by the digital repeater. This allows
nearly unlimited M-Bus networks.

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3.5 USB interface
The USB device port of the PW250 is as a USB 2.0 connector type B available on the front of the housing.
Please use a USB cable with a type A plug on one end and a type B plug on the other side (not supplied) to
connect a PC. You must install the software driver for the virtual COM port before you can use the USB
interface. This simulates a serial port that you can use as usual in your M-Bus software. You can find the
driver on our CD "Tools & Docs", on our homepage www.relay.de or directly from FTDI Chip, the manufacturer
of the used USB chip: http://www.ftdichip.com/Drivers/VCP.htm (here you will also find drivers for Linux and
Mac OS). Please start the unpacking with administrator privileges after download. To do this click on the
downloaded file in the File Explorer with the right mouse button and select the menu item "Run as
administrator“(example file name is: CDM v2.12.06 WHQL Certified.exe). The software will be first unpacked
and then installed.
Now you can connect the PC. The USB driver for the PW250 is installed automatically and generates a new,
virtual COM port. The new COM port number of the USB serial port is displayed after the installation is finished
(here: COM29). You can look up this number at any time in the Device Manager under ports (USB Serial Port)
and - if desired –change it in the advanced settings of the driver. Please select the appropriate comport
number in your M-Bus software.

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3.6 Ethernet interface
The Ethernet interface of the PW250 converts the physical interface Ethernet 10/100BaseT to M-Bus and the
TCP / IP protocol to the serial protocol. The Ethernet interface is available in the front panel as an 8-pin RJ45
socket. The PW250 can be integrated into an existing local network and the M-Bus meters can be read from
one or more PCs in that network. This requires the so-called “Tibbo Device Server Toolkit” to be installed on
that PC. With this software the Ethernet interface is configured in the PW250 and a virtual COM port is set up.
This simulated serial interface enables the use of the usual M-Bus software designed for normal serial
interfaces. Please perform the following steps of installation:
3.6.1 IT preparations
The IT division of the network containing the PW250 must define the following items:
▪Fixed IP address must be identical to the IP range of the reading computer. Only the last number must
be different. (e.g. 192.168.1.239)
▪You need also the subnet mask and IP address of the gateway if the IP addresses are reassigned by a
gateway.
▪The converter uses the port 1001 by default for the TCP protocol. This port must not be blocked by any
firewall.
You can find your own IP address in your network this way:
Start –Run: cmd <OK>

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Input: ipconfig <enter>
Own IP address and subnet
mask will be shown
3.6.2 Software installation
You can find the driver software on our CD “Tools&Docs”, on our homepage www.relay.de or directly at the
manufacturer´s site: http://tibbo.com/downloads/soi/tdst.html. Please start depending on your operating
system either the 32 bit or 64 bit version of the installation program as an administrator:
tdst_5-09-12-x86.exe (32-Bit Windows) or tdst_5-09-12-x64.exe (64-Bit Windows)
TDST = Tibbo Device Server Toolkit, 5-09-12 = Version 5.09.12 dated August 2014)
After a reboot of the PC the installation of the drivers and software tools is completed.