Chapter 1
Hardware Overview
©
National Instruments Corporation
1-7
RS-485 Connector
The RS-485 port on the GPIB-485CT-A uses a standard 9-pin shielded
D-Subminiature male connector with screwlock assemblies. The RS-485
connector accepts standard 9-pin D-Subminiature female connectors.
Figure 1-7 shows a diagram of the serial connector and the signals
supported. For more information on the RS-485 signals refer to
Appendix E,
Interfacing to an RS-485 Device
.
Figure 1-7.
The RS-485 Connector and Signal Designations
GND
CTS+(HSI+)
RTS+(HSO+)
RXD+
RXD–
2345
1
6789
CTS - (HSI –)
TXD +
RTS - (HSO –)
TXD –
