Impulse SIO4-104.485 (3543) - Manual (Page 12)

© Sealevel Systems, Inc. - 10 - SIO4-104.485 User Manual
Available for use with the SIO4-104.485 are the CA228, the CA110/CA143, and the
CA222/TB10 combination cables. These cables terminate the SIO4-104.485 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-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
Note: Please terminate any control signals that are not being 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 ensure you get the best performance from your adapter.