Eaton easy800

2 Installation
2.8 Connecting the serial interface
60 Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
Calculating cross-section with known cable lengths
The minimum cross-section is determined for the known maximum extent of
the easyNET network.
l = Cable length in m
S
min
= Minimum cable cross-section in mm
2
ρ
cu
= Resistivity of copper, if not otherwise stated 0.018 Ωmm
2
/m
Calculating length with known cable cross-section
The maximum cable length for a known cable cross-section is calculated as
follows:
l
max
= Cable length in m
S = Cable cross-section in mm
2
ρ
cu
= Resistivity of copper, if not otherwise stated 0.018 Ωmm
2
/m
2.8 Connecting the serial interface
Each easy800 device is provided on the front with a serial interface. The
interface on easy800 standard is factory shipped with a protective cover
fitted. Remove this cover carefully.
The serial interface is used for:
• connecting the programming cable to the COM serial interface on the PC
and thus as a connection for the easySoft or easySoft-Pro programming
software.
• the point-to-point communication with MFD-CP4, MFD-CP8 or MFD-
CP10. MFD-CP… must be operated in Terminal mode and thus enable
texts to be output and operator entries. This terminal connection is
supported by easy800 standard from device version 04 and
easy800-SWD from device version 01. Information on MFD-CP4 is
provided in the manual ￫ MN05013011Z-EN.
• the point-to-point communication between an MFD in COM-LINK mode
and an easy800 device for exchanging data (MB, MW, MD). This serial
connection is supported by easy800 standard from device version 04 and
easy800-SWD from device version 01.
• the communication via the EASY209-SE Ethernet gateway with an
Ethernet network, see manual “EASY209-SE Ethernet Gateway“,
MN05013012Z-EN.
• a memory card on easy800 standard (“memory interface“ function).
S
min
=
l
.
ρ
cu
12.4
￫
If the calculation result does not correspond to a standard cross
section, take the next higher cross section.
l
max
=
S
.
12.4
ρ
cu