Technical Information C23-SATA • PCIe to SATA RAID Controller Mezzanine Card
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For selection of the TR1 operating mode, a five position dual row pin header is provided, named
J-SER. A single jumper selects between the following transfer characteristics:
•
Jumper J-SER position 3 must be set for RS-232 operation.
Remove also jumpers J-TRM1 and
J-TRM2
.
•
Jumper position 5 is suitable for RS-485 point-to-point connection (full-duplex mode =
sending and receiving data simultaneously across a double twisted pair cable). The TxD
transmitter is permanently enabled.
•
Jumper positions 7 and 9 must correspond to the software protocol in use in a bus structured
RS-485 topology (party line, transmitter outputs and receiver inputs connected together using
a single twisted pair cable, half-duplex transmission). Either RTS or DTR can be used for
transmitter control.
In rare cases, a node has to be configured as listener only. Simply remove the jumper from J-SER in
order to permanently disable the RS-485 TxD transmitter.
Please note: Do not stuff more than a single jumper to J-SER. Do not install the jumper to other
positions than shown above.
In addition to J-SER, there may be two jumpers provided for on-board line termination of the RS-485
J-SER
RS-485 - Transmitter Always Enabled
RS-232
Transceiver Mode Controlled by GP40
RS-485 - Transmitter Enabled with RTS
RS-485 - Transmitter Enabled with DTR
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240.2.04 © EKF ekf.com
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