New Low Profile PCI Adapter Provides Versatile
Synchronous Serial Interface
 Configure a single port for RS-232, RS-422, RS-485, RS-530, RS-530A, or V.35 communication protocols.
• Z85230 Enhanced Serial Communications Controller (ESCC™)
• Data rates to 128K bps
• MD1 Low Profile and Universal Bus (3.3V
and 5V) compatible
• DB-25M connector
• Versatile cabling options
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SeaDAC USB Family Offers Wide Range of Digital I/O
Opportunities
 Choose I/O options including Reed and Form C relays, optically isolated inputs, A/D and D/A functionality, and then interface via USB.
• Highly retentive USB Type B connector prevents accidental cable disconnection
• Rugged attractive plastic enclosure
• Includes helpful diagnostic utilities and sample programs
• Available in extended temperature versions
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Tech Lowdown
Do I need to connect a ground line using RS-422, RS-485 communications?
The short answer is yes. Differential serial communications such as RS-422 and RS-485 use the ground as a reference. If there is no ground, the reference is basically floating. Electrically, it will work unless the floating reference causes the data line voltage to exceed the common mode range of the transmitter/receiver. If you have devices on different power circuits there is a high probability of ground differences that can lead to communication failures.
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