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  1. Products
  2. RS485 Repeater
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PSM-ME-RS485/RS485-P Repeater

RS485 to RS485 Repeater

PSM-ME-RS485/RS485-P Repeater
  • Amplify RS485 signals up to 1.2km [4000 feet]
  • Add 32 nodes to an RS-485 data circuit
  • Transmission speeds up to 1.5 Mbps
  • 3-way isolation between all interfaces
Get a quote Product Question?
  • Overview
  • Hardware Specs
  • Application Diagrams
  • Documentation
  • Ordering Details

Boost, or amplify, RS-485 signals to cover longer distances with the PSM-ME-RS485 Repeater. By using differential voltage lines for data and control signals RS-485 repeaters overcome the limitations of standard serial ports. This allows you to add 4,000 feet (1.2 km) and 32 nodes to an RS-485 data circuit. In addition, 3-way isolation protects devices from transient surges and ground loops on the data line.

The PSM-ME-RS485 repeater was developed for the high requirements of fieldbus systems. The device can be powered by wall-mount AC or snapped onto standard DIN rails and supplied with 24 V DC or AC.

The PSM-ME-RS485 repeater can be used in all common 2-wire bus systems: Modbus, RACKBUS (Endress &Hauser), SUBCONET-K (Moeller), UNI-TELWAY (Telemecanique), DANBUS (Danfoss), RS-BUS (Landis & Staefa), NET 2000 (B&R), INSUM (ABB), J-BUS (Merlin Gerin), ET-WAY (Jetter), S-BUS (SAIA) and around 60 more company-specific bus systems.

For potential separation and range increase in RS-485 2-wire bus systems, the PSM-ME-RS485 repeater is the optimal solution.

RS485 Repeater Features

  • Supports all popular 10/11-bit UART data formats
  • Automatic transmit/receive changeover
  • Transmission speeds of 1.2 kbps up to 1.5 Mbps
  • Integrated, connectable termination resistors
  • High-quality 3-way isolation between all interfaces
  • Integrated surge protection with transient discharge to the DIN rail
  • Supply voltage of 24 V DC or AC to suit the control cabinet
  • Plug-in screw connection terminal blocks
  • Space-saving slim 22.5 mm device
  • Shipbuilding approval per DNV

ROHS Compliant
Din Rail Compliant
ATEX Compliant
Modbus Compliant
DNP Compliant

PSM-ME-RS485/RS485-P Technical Specifications

Serial interface
Interface 1 RS-485 interface, in acc. with EIA/TIA-485, DIN 66259-4/RS-485 2-wire
Operating mode Semi-duplex
Connection method Pluggable screw connection
File format/coding UART (11/10 bit switchable; NRZ)
Data direction switching Automatic control, min. station response time 1 bits
Transmission medium 2-wire twisted pair, shielded
Transmission length ≤ 1200 m (depends on transmission speed, bus system and cable type)
Cascadability 9 (4,8 ... 93,75 kbps)
8 (115.2 kbps)
7 (136 kbps)
6 (187.5 kbps)
5 (375 ... 1500 kbps)
Termination resistor 390 Ω
180 Ω
390 Ω (Can be connected)
Conductor cross section flexible min. 0.2 mm²
Conductor cross section flexible max. 2.5 mm²
Conductor cross section AWG min. 24
Conductor cross section AWG max. 12
Protocols supported transparent protocol
Serial transmission speed 1.2 / 2.4 / 4.8 / 9.6 / 19.2 / 38.4 / 57.6 / 75 / 93.75 / 115.2 / 136 / 187.5 / 375 / 500 / 1500 kbps
Interface 2 RS-485 interface, in acc. with EIA/TIA-485, DIN 66259-4/RS-485 2-wire
Operating mode Semi-duplex
File format/coding UART (11/10 bit switchable; NRZ)
Data direction switching Automatic control, min. station response time 1 bits
Transmission medium 2-wire twisted pair, shielded
Transmission length ≤ 1200 m (depends on transmission speed, bus system and cable type)
Cascadability 9 (4,8 ... 93,75 kbps)
Conductor cross section flexible min. 0.2 mm²
Conductor cross section flexible max. 2.5 mm²
Conductor cross section AWG min. 24
Conductor cross section AWG max. 12
Protocols supported transparent protocol
Serial transmission speed 1.2 / 2.4 / 4.8 / 9.6 / 19.2 / 38.4 / 57.6 / 75 / 93.75 / 115.2 / 136 / 187.5 / 375 / 500 / 1500 kbps
Ambient Conditions
Ambient temperature (operation) -40 °C ... 70 °C
Ambient temperature (storage/transport) -40 °C ... 85 °C
Permissible humidity (operation) 10 % ... 95 % (non-condensing)
Altitude 5000 m (For restrictions see manufacturer's declaration)
Degree of protection IP20
Noise immunity EN 50 082-2
General
Electrical isolation VCC // RS-485 (A) // RS-485 (B)
Test voltage data interface/power supply 1.5 kVrms (50 Hz, 1 min.)
Electromagnetic compatibility Conformance with EMC Directive 2014/30/EU
Net weight 188.8 g
Housing material PA 6.6-FR
Color green
MTTF 1808 Years (SN 29500 standard, temperature 25°C, operating cycle 21 % (5 days a week, 8 hours a day))
796 Years (SN 29500 standard, temperature 40 °C, operating cycle 34.25 % (5 days a week, 12 hours a day))
334 Years (SN 29500 standard, temperature 40°C, operating cycle 100 % (7 days a week, 24 hours a day))
Conformance CE-compliant
ATEX II 3 G Ex nA IIC T4 Gc (Please follow the special installation instructions in the documentation!)
UL, USA/Canada 508 recognized
Noise emission EN 50 081-1
Transmission channels 2 (1/1), TD, RD, half duplex
Bit delay < 200 ns
Bit distortion < 1.5 %
Test voltage data interfaces 1.5 kV AC
Test voltage data interface/power supply 1.5 kV AC
Degree of pollution 2
IECEx Ex nA IIC T4 Gc
Bit distortion, input max. ± 35 %
Bit distortion, output < 3.6 %
Power supply
Nominal supply voltage 24 V AC/DC
Supply voltage range 18 V AC/DC ... 30 V AC/DC (via pluggable COMBICON screw terminal block)
Typical current consumption 90 mA (24 V DC)
Max. current consumption 100 mA
Conductor cross section flexible max. 2.50 mm²
Conductor cross section flexible min. 0.20 mm²
Conductor cross section solid max. 2.50 mm²
Conductor cross section solid min. 0.20 mm²
Max. AWG conductor cross section, flexible 12
Min. AWG conductor cross section, flexible 24
Conductor cross section AWG max. 12
Conductor cross section AWG min. 24
Dimensions
Width 22.5 mm
Height 99 mm
Depth 114.5 mm
PSM-ME-RS485-REPEATER
Environmental Product Compliance
China RoHS Environmentally Friendly Use Period = 50
Reach and RoHS Compliant Reach and RoHS Compliant
Standards and Regulations
Electromagnetic compatibility Conformance with EMC Directive 2014/30/EU
Free fall In acc. with IEC 60068-2-32
Result: 1 m
Vibration resistance In acc. with EN 60068-2-6/IEC 60068-2-6
Result: 5g, 10...150 Hz, 2.5 h, in XYZ direction
EMC Immunity EN 61000-4-2: Contact discharge ± 6 kV (Test Level 3), Indirect discharge ± 6 kV (Test Level 3)
EN 61000-4-3: Frequency range 26 MHz ... 3 GHz (Test Level 3)
EN 61000-4-4: Criterion B
EN 61000-4-5: Signal ± 1 kV (Data line, asymmetrical)
EN 55011
EN 61000-4-6: Frequency range 0.15 MHz ... 80 MHz
Conformance CE-compliant
ATEX II 3 G Ex nA IIC T4 Gc
UL, USA/Canada 508 recognized
Noise emission EN 50 081-1
Noise immunity EN 50 082-2
Shock In acc. with EN 60068-2-27/IEC 60068-2-27
Result: 25g, 11 ms period, half-sine shock pulse
Connection in acc. with standard CUL
IECEx Ex nA IIC T4 Gc
UL, USA/Canada Class I, Div. 2, Groups A, B, C, D
Class I, Zone 2, AEx nA IIC T4
Class I, Zone 2, Ex nA IIC T4 Gc X
Approvals
UL Recognized
cUL Recognized
DNV
EAC
KC
cULus Recognized
UL Listed
cUL Listed
IECEx
ATEX
cULus Listed
Commercial data
Packing unit 1
Weight per piece 202.0 g
Country of origin Germany
PSM-ME-RS485/RS485-P Repeater Applications
  • Electrical isolation and bus segmentation
  • Increasing system availability
  • Increasing the range
  • Increasing the transmission speed
  • Extending the number of devices
  • Creation of mixed and network structures
Linear Network Diagram
The PSM-ME-RS485 repeater can be used to create network structures that are tailored to the relevant application. The limits set by the RS-485 standard are therefore extended. The standard defines the following basic specifications:
  • Up to 32 devices per potential segment
  • Only line structures
  • Maximum bus cable length: 1200 m
  • Maximum branch line length without termination resistor: 5 m, depending on the transmission speed
  • Bus cable termination at the start and end of the bus cable
RS485 Repeater Network diagram
Block diagram
RS485 Repeater Block diagram
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