Also check out our large selection of serial PCMCIA IO cards by Quatech and Socket Communications.

USB-Serial Adapters                               

Features

• 1, 2, 4, 8 or 16 independent ports
• Device enumerates itself as standard RS-232 COM ports
• Max baud rate 460.8k bps
• Full modem control and hardware and software flow control
• Surge suppression available
• Bus powered, no external power required
• 5 year warranty

Description

USB to RS-232 serial adapters are easily configured to enable the continued use of legacy devices without making any changes to the applications written for them. The adapters enumerate themselves as standard COM ports making the USB interface completely transparent to software.

Implementing RS-232 serial devices via USB provides many advantages. It enables "plug & play" capability as well as hot-swapping. And, while in standard systems each RS-232 device requires a separate port on the PC, with Quatech adapters a single USB port can be used to implement 8 serial devices. In addition, Quatech USB to serial adapters contain deep data FIFOs and use an accelerated UART clock frequency to further boost data rates. A single port on the adapter can typically achieve 230.4k bps data rates, and under certain conditions may be capable of up to 460.8k bps.

Detailed Specifications: USB to RS-232 Serial Adapters

Bus Interface: USB 1.1, USB 2.0 compatible

OS Support: Windows 98/Me/NT/2000/XP

Data Rate*:

*460.8 kbps possible for any one port under certain conditions
Actual baud rates depend on many external factors including hardware flow control, horsepower of the host computer, quality and length of cables, and whether data flow is continuous or "bursty."

Serial Ports Provided: SSU:1  DSU:2  QSU:4  ESU:8  HSU:16

USB Ports Required: SSU:1   DSU:1  QSU:1  ESU:1  HSU:2

UARTs: 16550 UARTs with 16-byte FIFOs (1 per port)

Transceiver: SP211HB

RS-232 Output:
       Voltage Swing: ±5V (min), ±7V (typ)

RS-232 Input:
       Voltage Range: -15V (min), +15V (max)
       Input Threshold Low: 0.8V (min), 1.2V (typ)
       Input Threshold High: 2.4V (max), 1.7V (typ)

IND Option: Surge suppressor applied to each line that is capable of sustaining up to 40A peak, 8 x 20µs transient surges, a clamping voltage of 30V and a peak energy dissipation of 0.1 Joules. (NOTE: The "IND" option limits data rate to 115.2 kbps)

Environment:
       Operating: 0°C to 70°C
       Storage: -50°C to 80°C
       Humidity: 10% to 90%

Power Requirements:
       Bus-powered device, no external power supply required.
       Suspend power: < 500 µA
       Unconfigured power: < 100 mA
       Configured Power: < 500 mA

Size:
       SSU: 3.6” L x 1.7” W x 1.0”H
       DSU/QSU: 7.2” L x 4.2” W x 1.0” H
       ESU: 9.3” L x 6.5” W x 2.5” H (Rev G and earlier)
       ESU: 7.1” L x 5.3” W x 2.3” H (Rev H and later)
       HSU: 9” L x 6.5” W x 4.5” H

Connectors: DB-9 male

Certifications: CE, FCC Class B

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Last modified: 07/01/08