December 2008 - Issue 12 Vol. 7

Test your knowledge with Tom’s monthly trivia question.
Why did Hammond Electric Organs that were made for the US sound flat when played in England?

Click here if button does not work

First 10 correct responses
win Sealevel stuff.

Who was the Cook County Assessor’s office clerk in "The Blues Brothers?"

Steven Spielberg


Suffering from USB disconnection?

Sealevel’s First PCI Express Digital I/O Board
PCI Express Digital I/O Board

The 8004e PCI Express X1 digital I/O interface provides 16 optically isolated inputs and 16 Reed relay outputs.

  • Optically isolated inputs protect the PC from voltage spikes commonly found in industrial environments
  • The Reed relays provide long-life, dry contact switch closures that are suitable for low current applications
  • Reed relays are normally open and close when energized

Read about the 8004e (rated for 3-13V input) and the 8004He (rated for 10-30V input) PCI Express digital I/O adapters.

USB Bus-Powered Digital I/O Adapter
USB Digital Interface Adapter

Control and monitor 16 optically isolated inputs and 16 Reed relay outputs via any USB connection with the 8221.

  • Input range is 5-30VDC, while the long-life Reed relays are well suited to low current applications
  • Inputs and outputs are grouped into four-bit segments for easy wiring via removable 3.5mm terminal blocks
  • High-retention USB Type B connector prevents accidental disconnection of USB cable

Read about the 8221 USB to 16 isolated inputs and 16 Reed relay outputs digital I/O adapter.

Tech Lowdown – Can I use Sealevel reed relay cards to switch other relays or inductive loads?

Sealevel Digital I/O products with reed relays are not designed to switch inductive loads such as the coil on another relay. If you need to switch an inductive load, Sealevel recommends using a Digital I/O product with Form C relays instead. You should remember to place a diode parallel to the coil to suppress the inductive kickback voltage. Failing to install a diode will shorten the life of the relay contacts.


PCI RS-232 Serial Interface

PCI RS-232 Serial Interface
The 7104S PCI serial interface provides maximum reliability in data intensive applications.

  • One RS-232 serial port
  • 16C850 UART with 128-byte Tx/Rx FIFOs
  • Supports data rates to 460.8K bps
Configurable Solid-State Industrial Computer

Configurable Solid-State Industrial Computer
The R2500, designed for harsh environments, offers exceptional performance and flexible I/O.

  • Up to 1.4GHz Intel Pentium M processor
  • Expand with up to three PC/104 kits
  • CDRW/DVD optional
PCI Digital Interface

PCI Digital Interface
Connect 8 Reed relay outputs (SPST) and 8 optically isolated inputs with the 8012S PCI digital interface.

  • Socketed dip resistor allows user configurable input range up to +24V
  • Universal bus (3.3V and 5V) compatible
  • Power (+5V and +12V) and ground provided on connector
Embedded USB to RS-232, RS-422, RS-485 Software Configurable DB9 Serial Interface Adapter

Embedded USB to RS-232, RS-422, RS-485 Software Configurable DB9 Serial Interface Adapter
The 2228 is a dual-port embedded USB to multi-interface serial adapter intended for mounting directly to a computer chassis.

  • All configuration and electrical selections are handle through the driver
  • Two ports each individually configurable for RS-232, RS-422, RS-485
  • High-speed UART with 128-byte Tx FIFO and 384-Byte Rx FIFO
Ethernet Modbus TCP to 32 Reed Relay Outputs

Ethernet Modbus TCP to 32 Reed Relay Outputs
The SeaI/O 440E provides 32 SPST Form A dry contact Reed relays for long life performance and fast response time.

  • Each relay can switch up to 60VDC @ 500mA
  • Removable screw terminals
  • Powered from your 9-30VDC source


Sign up for Sealevel eNews

Send to a Friend
(Emails are not automatically subscribed)

Visit for synchronous or asynchronous serial, analog or digital I/O, industrial computers or touchscreen HMI systems.