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External RJ45 Serial Port Jumper Block
The jumper block J5A2, located directly behind the external low profile RJ45 serial port, is used to
configure either a DSR or a DCD signal to the connector.
Serial Ports
The R700 provides two serial ports: an external low-profile RJ45 Serial port, and an internal Serial header.
The following sections provide details on the use of the serial ports.
Sreial Port A
Serial A is an optional port, accessed through a 9-pin internal header(J9A2). A standard DH-10 to DB9
cable can be used to direct Serial A out the back of a given chassis. The serial A interface follows the
standard RS232 pin-out. The baseboard has a Serial Port A silkscreen label next to the connector as well
as a location designator of J9A2. The Serial A connector is located next to the P64-C low-profile PCI card
slot. A standard DH-10 to DB9 cable is available from Acer in the R700 Serial Port Accessory Kit.
Pin
1
DCD
2
DSR
3
RX
4
RTS
5
TX
6
CTS
7
DTR
8
RI
9
GND
Serial Port B
Serial B is an external low profile 8-pin RJ45 connector that is located on the back of the board.
For those server applications that require an external modem, an RJ45-to-DB9 adapter is necessary.
A standard DH-10 to DB9 cable is available from Acer in the R700 Serial port Accessory Kit.
Serial Port Multiplexer Logic
R700 has a multiplexer to connect the rear RJ45 connector to either Serial Port A or Serial Port B in an
SR1300 chassis. This facilitates the routing of Serial Port A to the rear RJ45 connector if Serial Port B is
used for SOL( Serial Over LAN) in the SR1300 chassis. This serial port selection can be done through the
BIOS setup option.
The figure below shows the serial port mux functionality.
81
Signal Name
Serial Port A Header Pin -out
Chapter 5
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