Remember
Register
Home
/
Support
/
Support Forum
/
RS485 2 wires on Digi one IAP
Digi Forum
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Categories
Users
Ask a Question
Welcome to Digi Forum, where you can ask questions and receive answers from other members of the community.
All categories
Digi Remote Manager
(358)
Python
(978)
RF Solutions and XBee
(8,101)
Digi TransPort
(740)
Digi Connect Cellular
(419)
DAL
(2)
Embedded Devices
(4,082)
Rabbit
(3,155)
Console Servers
(341)
Modbus and Industrial Automation
(235)
Realport
(582)
Serial Servers
(810)
Satellite Modules
(25)
USB
(1,226)
Serial Cards
(713)
ConnectPort Display
(54)
Feedback/Wish List
(86)
Other/Legacy
(341)
RS485 2 wires on Digi one IAP
0
votes
The RS485 port 1 work perfectly well using 4 wires cabling. Unfortunately, our Modbus slave uses RS485 2 wires only. What is the configuration or the cabling to use a 2 wires RS485 on port 1 instead of a 4 wires RS485?
digi-one-iap
asked
Jul 29, 2015
in
Modbus and Industrial Automation
by
Jacques Stevens
New to the Community
(
0
points)
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
3 Answers
0
votes
Port 1 is the screw terminal. Keep in mind that we tie the rxd/txd +/- pins together when the device is in two wire mode.
You can use 3, or 6 for the + signal. And 4, or 7 for -. We also recommend that you use pin 5 gnd.
answered
Jul 30, 2015
by
Wingmaster1800
New to the Community
(
37
points)
Thank you very much for your answer! For the cabling, no problem of course. But I did not see any command to put the IAP in 2 wires mode in the configuration wizard. Is there a special command to use with telnet or tying the pins together is enough?
Please
log in
or
register
to add a comment.
0
votes
RS485 is enabled using the dip switch for the serial port. I have included a link to the quickstart guide which show the different modes used by the Digi One IAP.
http://ftp1.digi.com/support/documentation/90000634_E.pdf
answered
Jul 31, 2015
by
Wingmaster1800
New to the Community
(
37
points)
Thank you very much, it works now!
Please
log in
or
register
to add a comment.
0
votes
It'd be really cool if this were documented in a manual somewhere. Maybe include some example wiring diagrams like the rest of the industrial controls world?
answered
Dec 21, 2018
by
baj
New to the Community
(
1
point)
Please
log in
or
register
to add a comment.
...