Eight Channel RS232 Serial Relay Board

8 Channel Serial Relay Board with enclosure

Features

Low cost 8 channel serial relay board with heavy duty 10 Amp 250VAC/28VDC SPDT power relays, controlled through one of the PC RS232 serial ports.

Designed for single board operation or multiple board operation on the same serial port. Up to 16 boards can be connected in a daisy chain configuration, with up to a total of 128 - 10 Amp relays under PC control.

ASCII commands to control relays.
Easy hook up using standard Modular telephone cable, for connecting PC to single board and for multiple board configurations (9-pin serial to modular cable adapter required available separately).
Any software language that can write to the PC serial port can be used with this relay board NO special drivers needed.
4800-38400 baud (default 9600 baud)
Optional LED's to indicate relay activation (order the "-L" suffix version on the part number when ordering below). Note: The LED's are not visible on the -EXT version when the cover is on the enclosure.

Two versions available:

Model: S8-RLY-EXT - Relay board mounted in a plastic enclosure, powered by an external wall transformer (shown at top left).
Model: S8-RLY-INT - Bare board (no enclosure) with an on-board 120VAC 60Hz power transformer - for mounting in the customers enclosure or where multiple wall transformers would be impractical.

Applications

Industrial control applications
Automatic test equipment (ATE)
Process control systems
Power switching applications

 

Instruction Manual:

Eight Channel Relay Instruction Manual (213KB)

Application Note:

Application Note 115 (92K, PDF) - How to determine if our serial relay boards will operate with a specific software or operating system.

Application Note 156 (127K, PDF) - Board command information -- explains in detail the structure of the board commands.

 

Front View (External Transformer Version)

Model S8-RLY-EXT Includes:
8 Channel Relay board with 10 Amp power relays
1.2 Amp 9VDC output wall transformer.
6.89"L X 4.88"W X 1.5"H gray ABS plastic enclosure

Model S8-RLY-INT Includes:
8 Channel Relay board with 10 Amp power relays
1 Amp 120VAC on board power transformer

Note: To keep product costs low, the custom wired modular cable adapters are NOT supplied with the multiple board units.  Order the "-S" versions to include the adapter and cable.  Only one is needed to connect to the PC serial port, and the extra adapters would be unused in the multiple board applications.

The modular cable must be the standard telephone wiring configuration which is reverse wired. Network/data/printer cables will not work correctly.

For each additional relay board connected - one additional modular cable is required.  Longer modular cables can be purchased here.

 

Relay testing software available for Windows -- used to program and verify operation of the relays before writing your own software program.  Please note: The relay boards do not ship with software, see below to download the software or order the software on disk.

 

Software:

Relay Testing Software
Download software here or order on disk below.

Additional relay control software is available to operate the relay boards.

Software Examples:
Visual Basic
Visual Basic for Applications

See the support section for additional information.

Wiring Example for Multiple Board Applications

RS232 Multiple Serial Relay board wiring example

Quantity discounts available on order page.

Click on the order button next to the price to add this item to your shopping cart.

Single board on one serial port

Description  (External transformer version, with Enclosure) Part Number Price  
8Ch Relay Board, w/enclosure, transformer, with adapter & 7' cable S8-RLY-EXT-S $122.70 Click here to purchase
8Ch Relay Board, w/enclosure, transformer, with adapter & 7' cable  & LED's S8-RLY-EXT-LS $126.40 Click here to purchase

 

Description  (120 VAC Internal transformer version, NO Enclosure) Part Number Price  
8Ch Relay Board,  NO/enclosure, adapter & 7' cable S8-RLY-INT-S $98.20 Click here to purchase
8Ch Relay Board,  NO/enclosure, with adapter & 7' cable  & LED's S8-RLY-INT-LS $100.20 Click here to purchase

Note: The following boards are identical to the above units, but do not include the adapter (ADP-MOD) and 7' cable assembly (MC4-7) packaged with the units. For use in multiple board applications. Order only the adapter and cables needed to connect the multiple boards together.  Only one adapter is required to operate up to 16 boards on one serial port, for each additional relay board connected - one additional modular cable is required.

Multiple boards on one serial port

Description  (External transformer version, with Enclosure) Part Number Price  
8Ch Relay Board w/enclosure, transformer S8-RLY-EXT $117.45 Click here to purchase
8Ch Relay Board, w/enclosure, transformer  & LED's S8-RLY-EXT-L $121.15 Click here to purchase

 

Description  (120 VAC Internal transformer version, NO Enclosure) Part Number Price  
8Ch Relay Board NO/enclosure S8-RLY-INT $92.95 Click here to purchase
8Ch Relay Board NO/enclosure & LED's S8-RLY-INT-L $94.95 Click here to purchase

Accessories

Description Part Number Price  
Software Combo includes, RTP, CLS & ECP and application notes on Mini-CD SOFT-COMBO $5.95 Click here to purchase
9-pin PC serial to modular cable adapter ADP-MOD $4.25 Click here to purchase
7' 4-cond Modular telephone cable MC4-7 $1.00 Click here to purchase

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