rs232 / rs485 relay i/o interface

8, 0.5 Amp Relays, 4 digital Inputs

one event counter


The ADR2200 relay I/O interface allows control of 8 relay contact outputs, 4 contact or TTL inputs, and one event counter via an RS232 or RS485 link. The ADR2200 can effectively convert a standard PC to a powerful PLC (programmable logic controller). This low-cost serial relay contact interface is easy to use with Visual Basic, Basic, C, Labview, Testpoint, or other high level languages that allow access to a serial port. The ADR2000 series of data acquisition interfaces are daisy chainable up to ten units. All ADR2000 series boards contain RS232 to RS485 converters.

Dimensions: 5.4" X 2.8"
Click here to download the ADR2200 User Manual

NOTE: This product is also available in a 5 AMP version, see ADR2205

Key Features

Technical Specification

Supply Voltage 5VDC or 7-15VDC
Supply Current (Relays De-energized) 40mA Typical 50mA Max
Supply Current (All Relays Energized) 250mA Typical 300mA Max
Operating Temperature 0-50C
Contact Outputs (8)
Type Normally Open
AC Ratings 0.5Amp @ 120VAC MAX
DC Ratings 1 Amp @ 30VDC MAX
Relay Approvals UL, CSA
Digital Inputs (4)
Sink Current N/A
Source Current N/A
Event Counter (2)
Resolution 16-bit
Input Type Contact or TTL
Max Frequency 250Khz
Type RS232 and RS485 9600 Baud
(Higher baud rates available by special order up to 56K)
Daisy-Chain Up to ten boards




Power Adapter


The ADR2200 ships with user manual and a 6' RS232 cable.