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3590EKR, 3590EXP, 3590EXT, 3590 EBOX, CPWE, CPWET series indicator E-AF03_05.01_14.07_EN_T.doc
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!! IMPORTANT !!
THE CONNECTION AND THE SOFTWARE CONFIGURATION OF THE SERIAL PORTS MUST BE MADE BY
TECHNICAL PERSONNEL WHO KNOWS THE PROCEDURES ON THE BASIS OF THE USER’S NEEDS.
The data transmission cable must be kept away from the AC power supply lines.
!! REMOVE VOLTAGE BEFORE OPENING THE INSTRUMENT !!
THE STANDARD CONFIGURATION OF THE SERIAL PORTS IS THE FOLLOWING:
Baud rate = 9600, Parity = None, Data word = 8, Stop bit = 1, CTS signal = No Cts. The configuration may be modified in
the SET-UP environment in the
<< SERIAL >>
step.
5.1 RS 485 CONNECTION
IMPORTANT:
-
Respect the electrical precautionary measures indicated in section 1.
-
In the case of digital load cells connection read carefully and apply what is described in
chapter 2.2
Below is the RS485 connection of the indicator in the CoM3:
Meaning
Indicator
Serial line
TX+/RX+
22 A(+)
TX-/RX-
23 B(-)
On the same RS 485 line it’s possibile to connect up to 32 devices, among indicators, digital load cells, DGX conversion
cards or 485/232 signal converter.
Figure 1: electrical diagram of RS485 connections.
Use a
STP
(Shielded Twisted Pair) cable in order to make the connection (twisted and shielded pair/s with single
shielding for each pair through aluminium band and total shielding through external sheathing).
The maximum reachable length from the line with the use of the appropriate cable for RS 485 connections, the twisted
2x24 AWG duplex cable, shielded with external she aluminium band, is of about 1200 meters (see section
1.1.3)
With very long cables, the cable capacity (normally near 50pF/m) starts being a dominant factor in the power
consumption and increases with the increase of speed.