Impulse SIO4-104.2+2 (3544) User Manual
Page 12
© Sealevel Systems, Inc.
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SIO4-104.2+2 User Manual
Available for use with the SIO4-104.2+2 is the CA228, the CA110/CA143, and the CA222/TB10
combination cables. These cables terminate the SIO4-104.2+2 40-pin header to four DB9M
connectors. This termination provides the standard DB9 pin out for RS-232 (EIA/TIA574) in
RS-232 mode. The following table illustrates the DB9 pin out when using any of these optional
cables.
RS-232
Signal
Name
DB-9 Pin #
Mode
GND Ground
5
TD Transmit
Data
3
Output
RTS Request
To
Send
7 Output
DTR
Data Terminal Ready
4
Output
RD Receive
Data
2 Input
CTS
Clear To Send
8
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier Detect
1
Input
RI Ring
Indicator
9
Input
RS-422
Signal Name Pin
#
Mode
GND Ground
5
TX +
Transmit Data Positive
4
Output
TX-
Transmit Data Negative
3
Output
RX+
Receive Data Positive
1
Input
RX-
Receive Data Negative
2
Input
RS-485
Signal Name Pin
#
Mode
GND Ground
5
DATA+
Receive Data Positive
1
I/O
DATA-
Receive Data Negative
2
I/O