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25 Pin Connector Signal Layouts (DB-25 Male)
RS-232 Signals
RI- is connected to Port B CTS on the 85230 and the enable bit is set in Base+6.
DSR- is connected to Port B DCD on the 85230 the enable bit is set in Base+6.
Technical Note: Please terminate any control signals that are not going to be used. The most common way to do this
is connect RTS to CTS and RI. Also, connect DCD to DTR and DSR. Terminating these pins, if not used, will help
insure you get the best performance from your adapter.
Sealevel Systems ACB-MP.PCI
Signal
Name
GND
Ground
RD
Receive Data
CTS
Clear To Send
DSR
Data Set Ready
DCD
Data Carrier Detect
TXC
Transmit Clock
RXC
Receive Clock
RI
Ring Indicator
TSET
Transmit Signal Element Timing
DTR
Data Terminal Ready
TD
Transmit Data
RTS
Request To Send
Technical Description
Pin #
Mode
7
3
Input
5
Input
6
Input
8
Input
15
Input
17
Input
22
Input
24
Output
20
Output
2
Output
4
Output
Page 3
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