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WT.050.560.001.UA.IM.0714
78
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA
W3T140188
3.7
RS485 Interface
3.7.1
Printer Facility
The Depolox® 3
plus
is not able to send data directly to a printer.
3.7.2
Description of the RS485 Bus Interface
The serial RS485 bus interface of the Depolox® 3
plus
, built-in as a standard, is
used for data transmission to a PC, to an external plant control or to the MF485
interface card (e.g., for connection to a printer).
The serial RS485 bus interface of the Depolox® 3
plus
is designed as a sym-
metrical two-wires bus line to EIA RS 485 (DIN 66259 part 4 resp. ISO 8482),
that enables data transfer with high transfer rate (19.2 KBaud) and long dis-
tances (up to 1200 m).
Characteristics:
• Data transfer in both directions
• twin wire connection (half duplex)
• Bus structure (addressable interface, up to 32 bus users)
The interface works with differential voltage signals, ensuring high interference
susceptibility.
The bus system consists of a maximum of 32 passive users and one active user.
Only the active user (computer system) is entitled to start communication. The
Depolox® 3
plus
is always a passive user.
3.7.2.1
Cable
A shielded and twisted two-wire cable (twisted pair) is to be used. The shield
improves the electromagnetic compatibility. An unshielded cable can be used
if acceptable within the surroundings, that means, if no electromagnetic in-
terferences are expected.
The bus cable is connected from one user to the next. Stub cables of a maxi-
mum length of 0.3 m are allowed. The surge impedance of the cable should
be between 100 and 130 ohm, the cable capacitance preferably <60 pF/m and
the cross section 0.22 mm² (e.g., Li2CY(TP) 2x0.22 mm²). If using a shielded
cable we recommend to connect the shield on both sides with low resistance
(large cross sections and short cables) to protection ground, to have optimum
interference compatibility.
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