PS-4700/4800 Series (Atom N270 / Core 2 Duo P8400 Pre-installed Model) User Manual
103
COM Expansion Board (Built-in option)
The COM Expansion Board is an option which can be pre-installed when shipped.
The serial interface is a combined RS-232C/RS-422/RS-485 interface with D-SUB
9 pin connector.
The operating mode (RS-232C/RS-422/RS-485) is selected automatically,
depending on the electrical connection. The serial interface and COM Expansion
Board use a different pin assignment for RS-232C communication.
When using the COM Expansion Board for RS-232C communication, pins 1, 4, 6
and 9 are not connected to anything.
CAUTION
UNINTENDED PIN WIRING
Do not connect anything to n.c. pins.
Failure to follow the instruction can result in unintended communication.
COM Expansion Board Pin Assignments
Connector
D-Sub 9 pin plug
Type
RS-232C not modem compatible;
Electrically isolated
UART
16550 compatible, 16 byte FIFO
Transfer rate
Max. 115 kBit/s
Cable length
Max. 15 meters
(49.21 feet)
Max. 1200 meters
(3937.01 feet)
Pin
Assignments
(RS-232C)
Assignments
(RS-422)
1
n.c.
TXD\
2
RXD
n.c.
3
TXD
n.c.
4
n.c.
TXD
5
GND
GND
6
n.c.
RXD\
7
RTS
n.c.
8
CTS
n.c.
9
n.c.
RXD
1
5
6
9
Summary of Contents for PS-4700 Series
Page 1: ...PS 4700 4800 Series User Manual Atom N270 Core 2 Duo P8400 Pre installed Model...
Page 14: ...General Overview 14...
Page 62: ...Characteristics 62...
Page 86: ...Implementation 86...
Page 120: ...Configuration of the BIOS 120...
Page 138: ...Installation 138...
Page 160: ...Appendices 160...
Page 164: ...After sales service 164...