Table 19: Maximum number of devices per LonWorks network trunk
Device type Maximum allowed
SNE2200x model Supports one LonWorks network trunk with up to 255
LONWORKS devices (maximum)
SNE1100x models Supports one LonWorks network trunk with up to 127
LONWORKS devices (maximum)
Note: The SNE110Lx model does not support the
LonWorks network interface.
SNE1050x models Supports one LonWorks network trunk with up to 60
LONWORKS devices (maximum)
FTT10 nodes only 64 nodes if repeaters are not used; 255 nodes if repeaters
are used
Mixed FTT10 and LPT-10/11 nodes
1
([FTT10 x 2] + LPT10/11) < 128
Physical layer repeaters Maximum of 1 per segment
Terminators
2
Bus topology 2 bus type EOL terminators required (NU-EOL202-0)
Free topology 1 free topology terminator required (NU-EOL203-0)
1 Each NPT10/11 channel segment (between repeaters) requires its own power supply. Other factors, such as power consumption of
individual LPT10/11 devices, may limit a segment to fewer devices.
2 The SNE models with the LonWorks Network interface do not have an internal network terminator.
Table 20: Modbus RTU rules (RS-485 and RS-232)
Category Rules/maximums allowed
RS-485 RS-232
General SNE2200x model: two direct Modbus
RTU connections to FC BUS ports on
engine.
SNE1100x and SNE1050x models: one
direct Modbus RTU connection to FC BUS
port on engine.
SNE2200x model: two direct Modbus RTU
connections using a USB-to-RS232 adapter
connected to each USB port on engine.
SNE1100x and SNE1050x models: one direct
Modbus RTU connection using a USB-to-RS232
adapter connected to USB port.
Number of devices SNE2200x model: Up to 100 Modbus
(RS-485) devices per trunk (200 total).
SNE1100x model: Up to 100 Modbus
(RS-485) devices per trunk (100 total).
SNE1050x model: Up to 50 Modbus
(RS-485) devices per trunk (50 total).
All SNE models: Only one device using USB-
to-RS232 adapter.
Cable length Up to 1,520 m (4,987 ft) of RS-485 cable. Up to 15 m (49.2 ft) of RS-232 cable.
Cable Stranded cable, 0.6 mm (22 AWG)
3-wire twisted, shielded cable is
acceptable. Standard wiring qualified
for use with the N2 Bus or FC Bus is
acceptable. Stranded 0.6 (22 AWG) 4-
wire (two twisted pairs) shielded is also
acceptable.
Stranded cable, 3-9 conductors, serial data
grade, 20–24 AWG.
Terminations End-of-line (EOL) termination must
be set to On (or an EOL terminator
installed) on the two devices located at
either end of each bus segment on an
RS-485 bus. The EOL switches must be
set to Off (or EOL termination disabled)
for all other devices on the bus segment
on an RS-485 bus.
No termination
SNE Installation Guide 17
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