Documentation Number 485ABOIC1702 – pg. 1/2
© B&B Electronics -- June 2002
This product designed and manufactured in USA of domestic and imported parts by
Optically Isolated RS-485 to RS-485 PLC Converter
Connects to your PLC network safely
Model 485ABOIC
Description
Make quick and easy connections to your Allen Bradley® PLC® models SLC™ 500, 5/01, 5/02, & 5/03™
using B&B Electronic’s model 485ABOIC. The unit optically isolates balanced half-duplex RS-485 signals to
balanced half-duplex RS-485 signals, comparable to the converter provided by Allen Bradley. The 485ABOIC is
housed in a compact enclosure ready to be mounted on a DIN rail or panel.
Optical isolation adds security against conventional problems like ground loops, spikes, and surges that may
be present on data and control lines. No power supply is required as the module draws power from the PLC
connection. If needed, there is a 3-position screw terminal block for an external supply. An LED indicates power.
An included two-foot cable connects easily from the PLC to the unit using the 8-pin SDL Amp connector. The
6-position terminal block provides the RS-485 backbone link to the network. By using B&B’s model 232ABRJ45
(not included) handheld devices or PC/laptops can be connected to the RS-485 network through the RJ45 port.
The RJ45 jack can also be used for daisy chaining to another unit.
Features
•
Straight forward easy connections
•
Compact enclosure
•
DIN mountable
•
Panel mountable
•
Provides 2000 VAC isolation
•
Two-foot cable included for connections to the PLC
•
Two power method - directly from PLC or external (not
included)
•
Power status LED for quick reference
Connections
Power can be brought in through the optional external screw barrier strip as marked on the enclosure. The
RS-485 backbone network link is made through the removable terminal block with pin descriptions marked on the
enclosure. The PLC connection is made through the 8-pin Amp connector using the provided cable (male 8-pin
Amp to male RJ45). Table 1 shows the pin outs of the Amp connector. The RJ45 jack is designed for jumping to
another unit using a straight through RJ45 cable. It can also be used with B&B’s model 232ABRJ45 (not included)
to interface to a handheld device or PC/laptop. Table 2 shows the pin outs of the RJ45 jack.
Table 1 – 8 Position Amp Pin Outs
Table 2 – RJ45 Pin Outs
Signal
Pin Number
Direction
DATA +
1
Bidirectional
DATA -
2
Bidirectional
24VDC IN
3
Input
GND
4
Bidirectional
TX EN
5
Input
NC
6
N/A
GND
7
Bidirectional
24VDC OUT
8
Output
Signal
Pin Number
Direction
DATA +
1
Bidirectional
DATA -
2
Bidirectional
NC
3
N/A
GND
4
Bidirectional
TX EN
5
Input
NC
6
N/A
GND
7
Bidirectional
24VDC OUT
8
Output
