Chapter 4
Signal Connections
©
National Instruments Corporation
4-3
Getting Started with Your PCI/PXI-6810 SDA
I/O Connector Signal Connection Descriptions
Table 4-1 describes each signal connection on the 68-pin connector.
Table 4-1.
I/O Connector Signals
Pin
Signal Name
Description
19, 35, 43, 47–48, 51, 54,
56, 57–58, 60–61, 63–
64, 66–67
Reserved
Reserved—Pins labeled as reserved are intended for
future functionality from National Instruments. Do not
connect anything to these signals.
34
EXT_PWR
External Power—Provides power to the GPIO
transceivers for low-voltage test applications. Refer to
the 6810 specifications for appropriate voltage levels.
11, 14, 18, 20, 24, 27, 30,
33, 36–37, 39, 41–42, 46,
49–50, 55, 59, 62, 65, 68
GND
Ground—These pins are connected to the ground signal.
28, 29
RX_TX_<0+..0->
An RS-485 Differential Pair—A single channel on the
6810 device can either transmit or receive data on a
differential pair.
31, 32
RX_TX_<1+..1->
An RS-485 Differential Pair—A single channel on the
6810 device can either transmit or receive data on a
differential pair.
15–17, 21–23, 25–26
DIO<0..7>
Digital I/O—These eight signals provide static digital input
and output. The signals operate at 5 V TTL levels by
default, but can support low-voltage operation by drawing
power from the EXT_PWR signal.
8, 13
RTS<0..1>
Request to Send—An RS-232 handshaking signal driven
by the 6810 device. The 6810 will assert this signal, per
the RS-232 specification, whenever it is ready to receive
serial data.
7, 12
CTS<0..1>
Clear to Send—An RS-232 handshaking signal received
from a remote device. The 6810 device will generate
serial data acquisition whenever handshaking is enabled
and CTS is asserted, per the RS-232 specifications.
5, 9
TD<0..1>
Transmit Data—The 6810 transmits RS-232 serial data
on these signals.
6, 10
RD<0..1>
Receive Data—The 6810 receives RS-232 serial data on
these signals.
44, 45
Trig In, Trig Out
5 V TTL Trigger input and 5 V TTL Trigger output
