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Detailed Specifications: USB to RS-422/485 Serial
Adapters
Bus Interface: USB 1.1, USB 2.0 compatible
OS Support: Windows 98/Me/NT/2000/XP, Linux
Data Rate*:
| Model |
#Simultaneously Operating Ports |
Typical Max. Data Rate |
| DSU-200/300 |
1,2 |
230.4k bps |
| QSU-200/300 |
1,2 |
230.4k bps |
| 3,4 |
115.2k bps |
| ESU-200/300 |
1,2 |
230.4k bps |
| 3,4 |
115.2k bps |
| 5+ |
57-115.2k bps |
| HSU-200/300 |
1,2 |
230.4k bps |
| 3,4 |
115.2 k bps |
| 5+ |
57-115.2k bps |
*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."
Learn more about max data rates
Serial Ports Provided: DSU:2 QSU:4 ESU:8 HSU:16
(each configurable for RS-422 or RS-485, optional termination resistor
modules available)
Communication Modes: Full-duplex, Half-duplex using RTS, Half-duplex
using DTR, Half-duplex automatic transmitter control (learn more about
communication modes)
USB Ports Required: DSU:1 QSU:1 ESU:1 HSU:2
UARTs: 16550 UARTs with 16-byte FIFOs (1 per port)
Transceiver: MAX491 or compatible
Differential Driver Output (50 W
Load): +2V (min)
Differential Driver Output (27 W
Load): +1.5V(min), +5V (max)
High Input: +2V (min)
Low Input: +0.8V (max)
Driver Rise/Fall Time: 5ns (min), 15ns (typ),
25 ns (max)
Driver Input to Output Delay: 10ns (min), 30ns
(typ),60ns (max)
Receiver Input to Output Delay: 20ns (min),
90ns (typ), 150ns (max)
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 15.5V and a peak energy dissipation of 0.1 Joules. (NOTE: The
"IND" option limits data rate to 230.4 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:
DSU/QSU: 9.18 ” L x 5.25 ” W x 1.675”
H
ESU: 9.18” L x 5.25” W x 2.363” H
HSU: 9” L x 6.5” W x 4.5” H
Connectors: DB-9 female (see
connector pinout)
Certifications: CE, FCC Class B
Sales Information:
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