Technical Information C23-SATA • PCIe to SATA RAID Controller Mezzanine Card
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COM-A (RS-232/RS-485)
Front Panel Male D-SUB9 Connector EKF Part No. 261.02.009.23
RS-232
1
DCD (Input)
DSR (Input)
6
2
RxD (Input)
RTS (Output)
7
3
TxD (Output)
CTS (Input)
8
4
DTR (Output)
RI (Input)
9
5
GND
RS-485
1
DSR- (Input)
DSR+ (Input)
6
2
RxD- (Input)
TxD- (Output)
7
3
TxD+ (Output)
RxD+ (Input)
8
4
do not connect
do not connect
9
5
GND
The C23-SATA is equipped with three serial transceivers. This is a short description of TR1 (COM port
A), which corresponds to the lower front panel D-Sub 9 connector. The transceiver is a Sipex/EXAR
SP334 and can be operated in either TIA/EIA-232 mode (AKA RS-232), or in TIA/EIA-485 mode (AKA
RS-485). According to the transfer mode selected, the pin designations of the D-Sub connector will
change. Attachment of a RS-232 peripheral to the COM-A connector while having selected the
RS-485 operating mode should be avoided, just as vice versa.
1
5
6
9
261.02.009.23
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