M-Bus Connection
The CIPer Model 50 controller supports M-Bus Master functionality via its onboard RS232 / RJ45 socket.
It uses standard PW3/PW20/PW60 converters to connect to the M-Bus devices.
M-Bus Considerations
Max. no. of M-Bus devices per CIPer Model 50 is 60.
Bus Length
• Max. M-Bus length: 1050 feet from PW3 / PW20 / PW60, at communication rates of 9.6 kbps or slower
with shielded, twisted pair cable: 3322 or 3251.
• The M-Bus can be extended to 3000 feet, depending upon the communication rate, and provided that the
following electrical limitations are observed:
– Bus voltage must at no point fall below 12 VDC
– Maximum cable capacitance of 180 nF
For bus length extension, M-Bus repeaters can be used, but have not been tested by Honeywell. Hence, it is
the responsibility of the installing / commissioning personnel to ensure proper functioning.
Wiring Topology
M-Bus meters are connected to the bus cable in parallel.
Figure 52: Allowed M-Bus wiring topology
Cabling CIPer Model 50 to PW3/PW20/PW60
• Use the TECHTOO USB 3.0 and YIOVVOM DB9 Breakout Connector cable setup between the RS232 /
RJ45 socket of the CIPer Model 50 and the PW adapters.
• The TECHTOO USB 3.0 cable has a length of 10 ft, and the pin-out listed in Table 25.
• In case a third-party cable is used instead of the TECHTOO USB 3.0 cable, the third-party cable must have
a max. length of 45 ft and a max. cable capacitance of 2,500 pF.
Table 24. CIPer Model 50 RS232 / RJ45 socket specifications
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