
6LE007317A
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11.1.5. COMMUNICATION parameters menu
RS485
The MODBUS RTU protocol available on the HZI855 communicates via an RS485 series link (2 or 3 wires) which is used to operate,
configure or read parameters from a PC or an API.
In a standard configuration, a RS485 connection is used to connect 32 products to a PC or a controller up to 1200metres (1300yds) far.
N 1
N 2
N n
1200 M
R = 120 Ω
Gateway, EMS,
BMS, DCIM,
SCADA, PLC...
A LIYCY shielded twisted pair must be used. We recommend using HTG485H (25m Modbus cable), a shielded twisted pair with a
general LIYCY-CY shielding in a environment where there is interference or in a very long network with a number of products.
If the distance of 1200 m is exceeded and/or the number of products is greater than 32, a repeater must be added to enable
additional products to be connected.
A 120 Ohm resistor must be fixed at both ends of the connection.
N 1
repeater
RS485
+ - - +
N n
R = 120 Ω
max 1200 M ou 32 UL
max 1200 M ou 32 UL
R = 120 Ω
R = 120 Ω
Gateway, EMS,
BMS, DCIM,
SCADA, PLC...
Communication tables: can be found on the website at the following address:
http://hgr.io/r/hzi855