ICD400A Datasheet PDF


Part Number

ICD400A

Description

Quick Start Guide Manual

Manufacture

Block Box

Total Page 2 Pages
PDF Download
Download ICD400A Datasheet PDF


Features Datasheet pdf ICD400A Quick Start Guide In Figure 6-2, the converter is set up to use interna l bias and no termination with four wir es. the impedance of the transmission l ine being used. Termination increases l oad on the drivers, requires installati on complexity, changes biasing requirem ents, and makes system modification mor e difficult. Generally, termination sho uld only be used for long distances. If in doubt, leave it out.” ICD400A Isolated RS-232 to RS-422/485 Convert er BLACK BOX ® This rugged panel-mo unt BLACK B converter offers 2 kV isola tion. Withstands temperature variations from -40 to +176° F (-40 to +80° C). RS-485 4-wire DIP switch. Figure 6-2. RS-485 4-wire example. NOTE:  Shaded blac.
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ICD400A Datasheet
ICD400A Quick Start Guide
In Figure 6-2, the converter is set up to use internal
bias and no termination with four wires.
RS-485 4-wire DIP switch.
Figure 6-2. RS-485
4-wire example.
NOTE: Shaded black means the
DIP switch is ON.
RS-422 4-wire DIP switch.
7. Bias and Termination
The circuit can be biased using the built-in 2 k-ohm
pull-up and pull-down resistors. This is controlled with
DIP switch position 5. The default setting is ON (bias
resistors in).
When an RS-485 network is in an idle state, all nodes
are in listen (receive) mode. Under this condition, there
are no active drivers on the network. All drivers are
tri-stated. Without anything driving the network, the
state of the line is unknown. IF the voltage level at the
receiver’s A and B inputs is less than ±200 mV, the
logic level at the output of the receivers will be the
value of the last bit received. To maintain the proper
idle voltage state, bias resistors must be applied to
force the data lines to the idle condition.
If termination is necessary on the receive lines, a built-
in 120-ohm resistor can be switched in using DIP
switch position 6. In most cases, termination is not
required. The default setting is OFF (termination out).
Termination is used to match impedance of a node to
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Page 5
ICD400A
Isolated RS-232 to RS-422/485 Converter
the impedance of the transmission line being used.
Termination increases load on the drivers, requires
BLACKinstallation complexity, changes biasing requirements,
and makes system modification more difficult.
BOX®
Tcohnisverurtgegreodffpearns e2l-kmVounBtLACK
B
Generally, termination should only be used for long
distances. “If in doubt, leave it out.”
isolation.
8. Loopback Test/Troubleshooting
• Configure for RS-485 4-wire.
Withstands temperature variations
from -40 to +176° F (-40 to +80° C).
• Jumper terminals B to D and C to E.
• Connect a PC to the RS-232 port.
• TD and RD LEDs are ON when power is applied.
• U sing hyperterminal or a similar program, connect to
the appropriate COM port. Turn off hyperterminal
local echo.
• Transmit data. The same data should be returned.
When data is sent and looped back, the TD and RD
LEDs blink on and off indicating data flow.
Customer
Support
Information
Order toll-free in the U.S.:
Call 877-877-BBOX
(outside U.S. call 1-724-746-5500)
FREE technical support
24 hours a day, 7 days a week:
Call 724-746-5500 or
fax 724-746-0746
Mailing address:
Black Box Corporation
1000 Park Drive
Lawrence, PA 15055-1018
Web site: www.blackbox.com
E-mail: info@blackbox.com
© Copyright 2013. Black Box Corporation. All rights reserved.
Black Box and the Double Diamond logo are registered trademarks of
BB Technologies, Inc. Any other trademarks mentioned in this manual
are acknowledged to be the property of the trademark owners.
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Page 6
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