Hardware Connections; Db9F Connections; Port Identification; Changing The Com Port Assignments - Measurement Computing PCI-COM422/485 Series User Manual

The PCI-COM422/485 series provides 9-pin female "D" (DB9M) connectors that extend through the
backplate of the board.
3.1 DB9F CONNECTION S
The connectors on the PCI-COM422/485 boards provide the pin-out shown in Figure 3-1 below. The
view shown is looking into the connector.
3.2 PORT IDENTIFICAT ION
The PCI-COM422/485/2 port identities are shown in Figure 3-2 below:
3.3 CHANGING THE CO M PORT ASSIGNMENTS
In Windows 95/98, the PCI-COM ports is automatically installed, starting at COM5: (if available).
Alternatively, the next available port is assigned if COM5 is not available. Other ports on multi-port
boards are assigned in numeric sequence after the first port installed. If you wish to change the board's
initial COM Port number (e.g. from COM5: to COM3), please follow the procedure below. Additional
ports on the board will also be changed so that the COM port assignments are sequential.
1
GND
2
RTS+
3
RTS-
4
CTS+
5
CTS-
Figure 3-1. PCI-COM422/485 Connector Pinout
Figure 3-2. PCI-COM422/485 Board Port Locations
1. Right click on My Computer.

3. HARDWARE CONNECTIONS

6
RX+
7
RX-
8
TX+
9
TX-
10