HRW HPE-BNMBUS V401 Manual 180307 E. & O. E. / Subject to change without notice
Page 22 of 24
Connections
Dimensions
If using HDA0002 DIN rail adapter brackets the overall depth from the gear plate to the front surface of
the device is 45.5mm
HPE-BNMBUS
BACnet
MS/TP
M-Bus
EN1434
M-bus wiring guideline extracted from
www.m-bus.com
,
document MBDOC48, page 16;
A two-wire standard telephone cable (JYStY N*2*0.8 mm)
is used as the transmission medium for the M-Bus. The
maximum distance between a slave and the repeater
(gateway) is 350 m. This length corresponds to a cable
resistance of up to 29Ω.
This distance applies for the standard configuration having
Baud rates between 300 and 9600 Baud, and a maximum
of 250 slaves. The maximum distance can be increased by
limiting the Baud rate and using fewer slaves but the bus
voltage in the Space state must at no point in a segment
fall below 12V because of the remote powering of the
slaves in some cases.
In the standard configuration the total cable
length should not exceed 1,000m in order to meet the
requirement of a maximum cable capacitance of 180nF
HPECOMU
