DATALOGIC
DS6100
Installation - 2.19
RS485 Half-Duplex Interface
The RS485 half-duplex (3 wires + shield) interface is used for polled
communication protocols.
It can be used for Multidrop connections in a master-slave layout or with a
Datalogic Multiplexer, (see par. 2.8.3, 2.8.4 and 2.8.5).
Device connection to the Multidrop line can be controlled externally through the
RS485CNTR line. For example, it may be necessary to disconnect a scanner
from the line if the device is damaged or the line is overloaded. To do this,
apply a voltage from 12 to 30 Vdc to the RS485CNTR signal using GND as a
reference.
The following pins of the 19-pin connector are used for RS232 interface
connection:
Pin
Name
Function
R
RS485 transmit/receive data +
P
RTX485-
RS485 transmit/receive data -
V
GNDRS485
RS485 ground reference
U
RS485CNTR
multidrop device disconnect
RTX485-
GNDRS485
RS485CNTR
DS6100
USER INTERFACE
RXTX+
RTX485-
P
RXTX-
6
V GNDRS485
RS485GND
1
VS
B
Vext 12 to 30 Vdc
RS485CNTR
U
GND
A
GND
R
7
Figure 2.18 - RS485 half-duplex interface connections
Содержание DS6100
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