Chapter:
Connectors
Back Panel Connectors
page 22
Beckhoff New Automation Technology
CB1050
3.2.2 Parallel port, serial ports, VGA
On the rear panel, there is a combo connector which comprises three DSUB connectors, one for the parallel
port LPT, one for the serial port COM1, and one for VGA signals.
The LPT port is provided via a 25pin DSUB connector (female).
The serial interface COM1 is made available via a 9-pin standard DSUB-connector. According to the
product order, TTL level signals or RS232 standard signals are provided.
The port address and the interrupt are set via the BIOS setup.
The remaining 15pin DSUB connector (female) is used to attach a VGA display.
Pinout parallel port LPT:
Description
Name
Pin
Name
Description
strobe
STB#
1
14
AFD#
auto feed
data bit 0
PD0
2
15
ERR#
error
data bit 1
PD1
3
16
INIT#
initialize
data bit 2
PD2
4
17
SLIN#
select in
data bit 3
PD3
5
18
GND
ground
data bit 4
PD4
6
19
GND
ground
data bit 5
PD5
7
20
GND
ground
data bit 6
PD6
8
21
GND
ground
data bit 7
PD7
9
22
GND
ground
acknowledge
ACK#
10
23
GND
ground
busy
BUSY
11
24
GND
ground
paper end
PE
12
25
GND
ground
select
SLCT
13
Pinout serial port (DSUB connector):
Description
Name
Pin
Name
Description
data carrier detect
DCD
1
6
DSR
data set ready
receive data
RXD
2
7
RTS
request to send
transmit data
TXD
3
8
CTS
clear to send
data terminal ready
DTR
4
9
RI
ring indicator
ground
GND
5
