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  2. RS232 Serial Isolator
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PSM-ME-RS232/RS232-P Serial Isolator

Interface converter for the electrical isolation of RS-232 interfaces

PSM-ME-RS232/RS232-P Serial Isolator

PSM-ME-RS232/RS232-P Serial Isolator

PSM-ME-RS232/RS232-P Serial Isolator
  • 3-way isolation up to 2 kV
  • Transmission speed of 115.2 kbps
  • Integrated surge protection
  • Transmit TxD/RxD data channels and RTS/CTS control lines
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  • Overview
  • Hardware Specs
  • Application Diagrams
  • Documentation
  • Ordering Details

For the electrical isolation of RS-232 (V.24) interfaces, the PSM-ME-RS232/RS232-P is the ideal solution.

3-way EMI, RFI and Transient Surge Immunity

The RS-232 interface is an asymmetric voltage interface with common signal ground for all signals. In addition to its very low signal power, a characteristic feature of the interface is that the signal ground is connected to the grounded chassis housing. This results in very little immunity to interference and a maximum range of 15 meters. Using the PSM-ME-RS232/RS232-P Serial Isolator, considerably higher immunity to interference in industrial applications can be achieved.

By isolating the TX/RX data channels and the RTS/CTS control lines the PSM-ME-RS232 Serial Isolator effectively protects your RS232 devices from transient surges, lightning strikes, ground loops and noise issues.

With their high-grade 3-way isolation between both interface sides the PSM-ME-RS232 provides a floating and interference resistant RS-232 interface for the supply and ground potential. Expensive termination devices are also protected against damage by this decoupling.

Any additional potential EMI can be removed from the transmission path by using additional PSM-ME-RS232 Serial Isolators on both device interfaces.

The PSM-ME-RS232 Serial Isolators can be wall mount AC powered or snapped onto standard DIN rails supplied with 24V DC or AC. In the case of variable cable lengths, the RS-232 connection on the field side can be established conveniently using plug-in screw terminal blocks

Serial Isolator Features

  • Maximum transmission speed of 115.2 kbps
  • High-quality 3-way isolation up to 2 kV (VCC, V.24 (RS-232), TTY)
  • Integrated surge protection with transient discharge to the DIN rail
  • Transmission speed up to 115.2 kbps
  • Transmission of TxD/RxD data channels and RTS/CTS control lines
  • Active data transmission indicated by separate data indicators for the transmit and receive channels
  • 24 V DC or AC power supply suitable for the control cabinet

ROHS Compliant
Din Rail Compliant
ATEX Compliant
RS232 Compliant
DNP Compliant

PSM-ME-RS232/RS232-P Technical Specifications

Serial interface
Interface 1 V.24 (RS-232) interface in acc. with ITU-T V.28, EIA/TIA-232, DIN 66259-1
Connection method D-SUB 9 plug
Transmission length 15 m (shielded twisted pair)
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. 13
Pin assignment DTE/DCE switchover via switch
Protocols supported transparent protocol
Serial transmission speed 115.2 kbps
Interface 2 V.24 (RS-232) interface in acc. with ITU-T V.28, EIA/TIA-232, DIN 66259-1
Connection method Pluggable screw connection
Transmission length 15 m (shielded twisted pair)
Conductor cross section flexible min. 0.2 mm²
Conductor cross section AWG min. 24
Conductor cross section AWG max. 13
Ambient Conditions
Ambient temperature (operation) 0 °C ... 55 °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 61000-6-2:2005
General
Electrical isolation VCC // V.24 (RS-232) (A) // V.24 (RS-232) (B)
Test voltage data interface/power supply 2 kVrms (50 Hz, 1 min.)
Standards/regulations
Electromagnetic compatibility Conformance with EMC Directive 2014/30/EU
Net weight 123.18 g
Housing material PA
Color green
Conformance CE-compliant
UL, USA/Canada 508 recognized
Noise emission EN 61000-6-3
MTBF 2263 Years (Telcordia standard, 25°C temperature, 21% operating cycle (5 days a week, 8 hours a day))
438 Years (Telcordia standard, 40°C temperature, 34.25% operating cycle (5 days a week, 12 hours a day))
Transmission channels 4 (2/2), RxD, TxD, RTS, CTS; full duplex
Bit delay < 3 µs
Bit distortion < 5 %
Test voltage data interfaces 2 kV AC
Test voltage data interface/power supply 2 kV AC
Power supply
Nominal supply voltage 24 V AC/DC ±20 %
Supply voltage range 19.2 V AC/DC ... 28.8 V AC/DC
Typical current consumption 40 mA (24 V DC)
Protective circuit Surge protection Suppressor diode
Dimensions
Width 22.5 mm
Height 99 mm
Depth 118.6 mm
PSM-ME-RS232-SERIAL-ISOLATOR
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
EMC Immunity EN 61000-4-2: Contact discharge ± 6 kV (Test Level 3)
EN 61000-4-3: Frequency range Test Level 3
EN 61000-4-4: Criterion B
EN 61000-4-5: Signal ± 2 kV (12 Ω)
EN 55011
EN 61000-4-6
Conformance CE-compliant
UL, USA/Canada 508 recognized
Noise emission EN 61000-6-3
Noise immunity EN 61000-6-2:2005
Connection in acc. with standard CUL
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
cULus Recognized
UL Listed
cUL Listed
cULus Listed
Commercial data
Packing unit 1
Weight per piece 181.2 g
Country of origin Germany
Interference-free RS-232 interface
Use the PSM-ME-RS232/RS232-P Serial Isolator for considerably higher immunity to interference in industrial applications.
RS232 Serial Isolator Interference Free Network diagra
Electrical isolation
Use a PSM-ME-RS232/RS232-P Serial Isolator on both device interfaces to remove any potential EMI.
RS232 Serial Electrical Isolation Network diagram
Interface Converter
Interface adaptation Network Diagram
Block Diagram
RS232 Serial Isolator Block Diagram
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