National Instruments AT 用户手册
Appendix E
Specifications for AT Serial Hardware
E-10
ni.com
Four-Port AT Serial Boards (Nonisolated)
Dimensions .............................................10.67 by 16.51 cm
(4.2 by 6.5 in.)
I/O connector
1
.........................................10-position modular jack
Power Requirement
(from PC AT I/O channel)
(from PC AT I/O channel)
AT-485/4 ..........................................+5 VDC
160 mA typical
200 mA maximum
200 mA maximum
AT-232/4 ..........................................+5 VDC
110 mA typical
150 mA maximum
150 mA maximum
AT-485/4 (Shared IRQ)....................+5 VDC
160 mA typical
200 mA maximum
200 mA maximum
AT-232/4 (Shared IRQ)....................+5 VDC
110 mA typical
150 mA maximum
150 mA maximum
Four-Port AT Serial Boards (Isolated)
Dimensions .............................................10.67 by 25.40 cm
(4.2 by 10.0 in.)
I/O connector
2
.........................................10-position modular jack
Isolation voltage
From Port to Port .............................3000 Vrms/60s
From Any Port to Host
Computer .........................................2000 Vrms/60s
Computer .........................................2000 Vrms/60s
Power Requirement
(from PC AT I/O channel)
(from PC AT I/O channel)
AT-485/4 Isolated.............................+5 VDC
300 mA typical
360 mA maximum
360 mA maximum
AT-232/4 Isolated.............................+5 VDC
280 mA typical
320 mA maximum
320 mA maximum
1
The four-port AT serial board requires a cable to convert the 10-position modular jack to either DB-9 or DB-25 connectors.
2
The four-port isolated AT serial board requires cables, which are included in your kit, to convert the 10-position modular jack
to a DB-9 connector. Use only the type of cables provided in your kit.