HYDAC CS 1000 - Manual (Page 85)

ContaminationSensor CS1000 CS1000 in RS-485 bus
HYDAC Filtertechnik GmbH en Page 85 / 100
BeWa CS1000 3247149n en 2009-02-04.doc 2009-02-04
CS1000 in RS-485 bus
The CS1000 possesses an RS-485 interface which is to be used as a two-wire
interface in half-duplex operation.
The number of CS1000 per RS-485 bus is limited to 26 units because the HECOM
bus is addressed with the letters A – Z.
The length of the bus line and the size of the terminating resistance depend on the
quality of cable used.
The graphic below shows several CS1000 linked via the RS-485 interface and then
connected to a PC.
RS-485 +
RS-485 +
RS-485 +
max. 5 m
≈
10
00 m
Data+ Data-
10 VDC …
30 VDC
RS-485 -
HECOM Bus address
HECOM Bus address
HECOM Bus address
HECOM Bus address
RS-485 -
RS-485 -
B
C
.
.
.
.
.
.
.
.
.
.
.
Z
A
1
3
4
2.1
2.2
US
B-
B
USB-A
PC
Item Description HYDAC
Part no:
1 Converter RS232 <-> RS485 6013281
1 Converter USB <-> RS485 6042337
2.1 Connector cable RS232, 9-pole -
2.2 Connector cable USB [A] <-> USB [B] -
3 Recommended cable Twisted pair -
4 Terminating resistance ≈ 120 Ω -