Kontron VMP1 with Netbootloader - Manual (Page 34)

VMP1 Functional Description
ID 26037, Rev. 01 Page 2 - 12 ® 2002 PEP Modular Computers GmbH
2.4.3.3 Serial Interfaces and Pinouts
Two serial ports (RS232) are provided by means of two 8-pin
RJ45 connectors.
The RS232 serial interfaces named TERM and SER are 16C550 compliant and have
128-byte transmit and receive buffers. In addition to their other uses, the TERM port is
used
to interface with the bootstrap loader and the SER port is used to download soft-
ware.
Electrically, the two serial ports are identical and they provide a complete set of hand-
shaking and modem control signals, maskable interrupt generation and data transfer of
up to 115.2 KBaud.
The upper serial interface (SER) can also be configured to act as an RS485 interface.
The configuration of the interface is achieved by setting the RS_CTL bit in the Control
Register. Please refer to Table 4-14 in chapter 4.
Additionally, a module is available from PEP which provides an optoisolated half/full
duplex RS485 interface. For this reason the onboard SER connector on the VMP1
baseboard is not equipped. Please contact PEP Support department for more informa-
tion.
Pinouts of Serial Ports (RJ45 Connectors)
Table 2-3: Serial Port Pin Assignment
Pin Number Signal
RS485
Signal Half-duplex Signal Full-duplex
1 DSR NC -RxD
2 RTS NC NC
3 GND GND GND
4 TXD +TRXD -TxD
5 RXD NC NC
6 DCD NC +RxD
7 CTS -TRXD +TxD
8 DTR NC NC
1
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