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M-bus interface on COM interface (RS485)
Interface type
Baud rate
Internal bus termination
Internal bus polarization
Cabling (in-house cabling only)
Cable length
Protection
M-bus level converter including power supply (required)
1
For STV Electronic level converters, refer to https://www.stv-electronic.de/. For Relay GmbH level converters,
refer to https://www.relay.de/.
The use of these products is a recommendation only. Siemens cannot guarantee functionality nor take over any
warranty for third-party products. This information is subject to change without notice.
KNX PL-Link interface
Type
Cabling (in-house cabling only)
Cable length
Internal bus power
I/O modules TXM bus interface
Nominal voltage
Supply current for I/O modules TXM
Connectable in parallel with DC 24 V power supply
module TXS1.12F4
Protection
TXM I/O module plug: No protection against faulty
wiring with AC 24 V
10
Siemens Schweiz AG
Smart Infrastructure
EIA-485, electrically isolated
300, 600, 1200, 2400, 4800, 9600, 19200, 38400.
The maximum baud rate is depending on the
configuration of M-bus S-devices (subordinate devices)
and M-bus repeater.
120 Ohm, switchable with DIP switch
270 Ohm pull-up/pull-down resistances, switchable with
DIP switch
3-wire cable, shielded cable recommended (shield must
be connected to building earth in the mounting panel)
Max. 1000 m (3300 ft)
Short-circuit proof
Protection against faulty wiring with AC 24 V and
DC 24 V
Configuration examples (simple M-bus loads à 1.5 mA):
●
Up to 2 M-bus devices: STV Electronic, MPW-2
●
Up to 6 M-bus devices: STV Electronic, MPW-6
●
Up to 60 M-bus devices: Relay GmbH, PW60
KNX TP1 PL-Link, galvanic isolation
Baud rate: 9.6 kbps
2
2-wire cable, 0.75 mm
/ AWG20
2
or 1 mm
/ AWG18
With internal supply: Max. 80 m (262 ft)
With external supply: Max. 1000 m (3300 ft)
Max. 50 mA
When using external bus power for KNX PL-Link, switch
off the internal bus power via the ABT Site Tool.
DC 24 V
Max. 300 mA
For details, see: TX-I/O- engineering and installation,
CM110562
Short-circuit proof
No electric protection.
Use cover
1
1
1
A6V11937668_en--_l
2023-12-22
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