Documentation Number –p/n 8413R2 485LDRC9-0812qsg
©2010 B&B Electronics Manufacturing Company
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Underwriters Laboratories Conditions of Acceptability –
When installed in the end-use equipment, consideration
should be given to the following:
1.
The wiring terminals are suitable for factory wiring only.
2.
This device is to be mounted in a suitable enclosure in
the end-product.
3.
This device is suitable for operation at a maximum
surrounding air temperature as described in the
documentation.
4.
These devices are intended for use in a pollution
degree 2 environment.
Input Voltage: 10 – 30 VDC
Input Power: 0.5 Watts
Wire Range: 12 – 24 AWG
Tightening Torque: 4 kgf-cm
Temperature rating of field installed conductors is 105 C
minimum, sized for 60 C ampacity.
Use copper wire only
Maximum surrounding ambient air temperature 80 C.
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485LDRC9 Serial Converter
This Quick Start Guide
Additional Items Required but not included
o
Power Supply
o
RS-232 cable.
o
RS-422/485 Cable.
Put
Quick Start Guide
485LDRC9
Optically Isolated RS-232 to
RS-422/485 Converter
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Table 3 – Communications Mode
SW-1
SW-2
SW-3 SW-4
RS-485
ON
ON
ON
ON
2-Wire
Half Duplex
RS-485
ON
OFF
OFF
OFF
4-Wire
Full Duplex
RS-422
OFF
OFF
OFF
OFF
Full Duplex
Table 4 – Termination Resistor
SW-5
Use the 120Ω
ON
Built in Termination
Use External
OFF
or no termination
Table 5 – Timeout Selection
SW-6
SW-7
SW-8
Timeout
(MS)
1200
OFF
OFF
OFF
8.33
#
2400
OFF
OFF
ON
4.16
4800
OFF
ON
OFF
2.08
9600
ON
OFF
OFF
1.04
19.2K
ON
ON
ON
0.580
38.4K
OFF
OFF
OFF
0.260
#
57.6K
OFF
OFF
OFF
0.176
#
115.2K OFF
OFF
OFF
0.0868
#
Timeout selections are equal to one character time at the
indicated baud rate. Setting the converter 9600 will
generally work at 9600 and higher baud rates.
In RS-422
mode, timeouts are not required.
# To achieve these timeouts you must place a through -
hole resistor on the circuit board. See Step 5 for more
information.
2
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Terminal Block Signal
Direction
A
RS-232 Receive Data (RD)
Output
B
RS-232 Signal Ground (SG) -------
C
Power Ground (PWR GND)
-------
D
RS-232 Transmit Data (TD)
Input
E
NOT USED
-------
F
10 – 30 VDC Power Input
-------
G
RS-422/485 TD A(-)
Output
H
RS-422/485 TD B(+)
Output
J
NOT USED
-------
K
RS-422/485 RD A(-)
Input
L
RS-422/485 RD B(+)
Input
M
Isolated Ground
-------
DB9 F Pins (Converter is DCE)
PIN
Signal
Direction
2
RS-232 Receive Data (RD)
Output
3
RS-232 Transmit Data (TD)
Input
5
RS-232 Signal Ground (SG) -------
Note: On the DB9F Connector, control signals are looped
back. Pin 1 (DCD), Pin 4 (DTR), and Pin 6 (DSR) are tied
together. Pin 7 (RTS) and Pin 8 (CTS) are tied together.
3
4
