Mate

R25/R210
Dual Relay Controller
NCD RS-232 Networkable Dual Relay Controller

2” x 2” RS-232 Programmable Dual Relay Controller
Device Features
Control 256 Devices Simultaneously or Individually from a Single Serial Port
E3C Compliant Command Set with Programmable E3C Device Number
2 Relay Status LEDs
Dual Diode-Clamped Relay Driver Circuit
Small, Low-Profile Design
Reports Status ofthe Relays
Control Each Relay Individually or Both Relays at the Same Time
9600 Baud Operation
Programmable Power-Up Relay Activation Pattern
Query Input Selection
+12 VDC Operation
1-Way or 2-Way Communication
Just 2” x 2” Square x 1” High

Warranty
NCD Warrants its products against defects in materials and
workmanship for a period of 90 days. If you discover a defect,
NCD will, at itsoption, repair, replace, or refund the purchase
price. Simply return the product with a description of the problem and a copy of your invoice (if you do not have your invoice,
please include your name and telephone number). We will return your product, or its replacement, using the same shipping
method used to ship the product to NCD.
This warranty does not apply if the product has beenmodified
or damaged by accident, abuse, or misuse.
30-Day Money-Back Guarantee
If, within 30 days of having received your product, you find that
it does not suit your needs, you may return it for a refund. NCD
will refund the purchase price of the product, excluding shipping/handling costs. This guarantee does not apply if the product has been altered or damaged.
Copyrights and TrademarksCopyright 2000 by NCD. All rights reserved. Other brand and
product names are trademarks of registered trademarks of their
respective holders.
Disclaimer of Liability
NCD is not responsible for special, incidental, or consequential
damages resulting from any breach of warranty, or under any
legal theory, including lost profits, downtime, goodwill, damage
to or replacement of equipment orproperty, and any costs or
recovering, reprogramming, or reproducing any data stored in
or used with NCD products.
Technical Assistance
Technical questions should be e-mailed to Ryan Sheldon at
ryan@controlanything.com. Technical questions submitted via
e-mail are answered up to 20 times daily. Technical support is
also available by calling (417) 646-5644.
NCD Contact Information
Mailing Address:National Control Devices
P.O. Box 455
Osceola, MO 64776
Telephone:
(417) 646-5644
FAX:
(417) 646-8302
Internet:
ryan@controlanything.com
www.controlanything.com
www.controleverything.com

Introduction to the R25/R210 Dual Relay Controllers
The R2 Series Dual Relay Controllers were designed
to service small computer-controlled switching needs
with maximum flexibility andexpandability.
The R25 is equipped with 2 Aromat 5-Amp Relays capable of switching AC Loads up to 5 Amps at 240 VAC
or 5 Amps at 24 VDC.
The R210 is equipped with 2 Omron 10-Amp Relays
capable of switching AC Loads up to 10 Amps at 240
VAC or 10 Amps at 24 VDC.
Both types of relays are hermetically sealed to prevent
moisture and dust contamination, extending the useful
life of the relays.
The R2Series supports RS-232 serial commands from
any computer or microcontroller capable of sending
ASCII character codes 0-255 at a 9600 baud (baud
rate is fixed).
The command set of the R2 allows individual control of
each relay or simultaneous control of both relays. The
command set also supports 1-way or 2-way communication, allowing you to read the status of the relays,
program automaticactivation of one or both relays
when power is first applied, and reading the power-up
default status of the relays.
The R2 is fully E3C compliant, allowing up to 256 NCD
devices to be shared on a single RS-232 serial port.
Each device can be controlled individually or multiple
devices can be controlled at once using the E3C command set. Extended E3C commands allow the user to
program the...