Quick Start Guide

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Dataline Surge
Suppressor
HESP4DR
DIN rail mount
power supply
MDR-20-24
First Things First...
Before you begin, be sure you have
the following:
707 Dayton Road | PO Box 1040 | Ottawa, IL 61350
Phone: [phone] | Fax: [phone]
www.bb-elec.com | E-mail: [e-mail]
Quick
Start
Guide
Document number – pn9830_R1_485OPDR-HS_3213qsg
Troubleshooting
Q. What are the factory presets?
A. “2-Wire” RS-485 half duplex operation; echo off, bias in,
termination out.
Switches 1, 2, 3, 4, 5 = ON
Switche 6 = OFF.
Switches 7, 8 = Not used.
Q. I want to use “4-Wire” RS-485 but the “4-Wire” RS485
devices do not respond with data.
A. When this unit is used to talk to a “4-Wire” device that
does not have biasing across the RS-485 receiver lines it may
be necessary to set the Transmitter to RS-422 Transmit mode:
Switch 1 = OFF.
This setting can be used providing that the master is on the
opposite side of the repeater. No other 4-Wire device can
be connected to the transmit lines on the side set for RS-422
transmit. The 485OPDRI has switches to enable separate
Transmit bias & Receive bias.
Biasing
Bias is provided by 4.7kΩ pull-up/down
resistors on the Data In lines. This value
is adequate for most applications without
termination.
485OPDR-HS
High Speed, Isolated
RS-422/485 Repeater
485OPDR-HS
Additional items required but not included:
Power Supply (10 to 30 VDC, 0.7 W)
RS-422/485 Cable