Technical Information C23-SATA • PCIe to SATA RAID Controller Mezzanine Card
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transmit- and receive signals:
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If set, J-TRM1 terminates the transmitter signal pair (output)
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If set, J-TRM2 terminates the receiver signal pair (input)
Typically, the termination resistors are chosen as 120 Ohm each (some people prefer 100 Ohms). For
half duplex mode (receive and transmit connected to each other) set either J-TRM1 or J-TRM2, but not
both.
A data transmission line operated in RS-485 mode must be terminated at both endings of the twisted
pair transmission cable (bus topology obligatory). Please avoid multiple termination for party-line
systems. Also
be aware to avoid double termination
, both on-board and simultaneously in the
external connector attached to COM-A.
COM-B COM-C (RS-232)
COM-B/C RS-232 Male D-Sub 9 261.02.009.23
1
DCD2 (3)
DSR2 (3)
6
2
RXD2 (3)
RTS2 (3)
7
3
TXD2 (3)
CTS2 (3)
8
4
DTR2 (3)
RI2 (3)
9
5
GND
The C23-SATA is equipped with two ADM211 serial transceivers, assigned to COM-B and COM-C. As
an option however, the front panel position for COM-C may be occupied by the audio connector.
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5
6
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