AppendixE Specificationsfor AT Serial Hardware
©NationalInstruments Corporation E-9 SerialHardware and Software for Windows
AT Serial Hardware

Hardware Characteristics

Two-PortAT Serial Boards (Nonisolated)

Dimensions.............................................10.67 by 16.51 cm
(4.2 by6.5 in.)
I/O connector..........................................DB-9
Powerrequirement
(from PC AT I/O channel)
AT-485/2..........................................+5VDC 390mA typical
510 mA maximum
AT-232/2..........................................+5VDC 260mA typical
340 mA maximum
AT-485/2(Shared IRQ)................... +5 VDC 140 mA typical
180 mA maximum
AT-232/2(Shared IRQ)................... +5 VDC 70mA typical
100 mA maximum

Two-PortAT Serial Boards (Isolated)

Dimensions.............................................10.67 by 18.70 cm
(4.2 by7.4 in.)
I/O connector..........................................DB-9
Isolation Voltage
From Port to Port............................ 3000 Vrms/60s
From AnyPort to Host
Computer........................................ 2000 Vrms/60s
PowerRequirement
(from PC AT I/O channel)
AT-485/2Isolated............................ +5 VDC 220 mA typical
260 mA maximum
AT-232/2Isolated............................ +5 VDC 160 mA typical
200 mA maximum