Functional Description
41
Universal Serial Ports
Two PC-compatible serial RS-232, 9-pin D-Sub ports are avail-
able and fully compatible with the 16C550 controller. These port
includes a complete set of handshaking and modem control sig-
nals. Data transfer rates up to 115.2 kB/s are supported.
The COM3 interface is routed to the connector CN1.
COM3 DB-9 Serial Port Connector (CN1)
Table 3-11: COM3 Serial Port Connector Pin Definition
The COM4 interface is routed to the connector CN6-2. The COM4
interface is compatible RS-232/422/485/485+.
COM4 DB-9 Serial Port Connector (CN6-2)
Table 3-12: COM4 Serial Port Connector Pin Definition
Pin #
RS-232
1
DCD, Data carrier detect
2
RXD, Receive data
3
TXD, Transmit data
4
DTR, Data terminal ready
5
GND, Ground
6
DSR, Data set ready
7
RTS, Request to send
8
CTS, Clear to send
9
RI, Ring indicator
Pin #
RS-232
RS422/485+
RS485
1
DCD, Data carrier detect
TXD-
Data-
2
RXD, Receive data
TXD+
Data+
3
TXD, Transmit data
RXD+
--
4
DTR, Data terminal ready
RXD
--
5
IsoGND, Isolated ground
GND
GND
6
DSR, Data set ready
--
--
7
RTS, Request to send
--
--
8
CTS, Clear to send
--
--
9
RI, Ring indicator
--
--
Содержание cPCI-3920 Series
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