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W&T
Centronics > Serial Interfaces
Manual
Centronics > Serial Interfaces
Model
W&T
Subject to error and alteration
Release
28000
26000
24000
1.0
17
W&T
Centronics > Serial Interfaces
© 08/2004 by Wiesemann & Theis GmbH
Subject to errors and changes:
Since we can make mistakes, none of our statements should be
used without checking. Please let us know of any mistakes or
misunderstandings you are aware of, so that we can recognize
and eliminate them quickly.
Perform work on and with W&T products only as described here
and only if you have read and understood the manual fully. Unauthorized use can result in hazards. We are not liable for the
consequences of unauthorized use. When in doubt, check with
us or consult you dealer!
18
W&T
Subject to error and alteration
Centronics > Serial Interfaces
19
W&T
Centronics > Serial Interfaces
Contents
Contents
Interface Centronics > RS232, Model 28000 ......................... 21
Interface Centronics > RS422, Model 26000 ......................... 25
Interface Centronics > 20mA, Model 24000 .......................... 29
20
W&T
Centronics > Serial Interfaces
Interface Centronics > RS232, Model 28000
Function
The W&T-Interface 28000 allows uni-directional connection of
peripherals equipped with an RS232 port to the parallel port on
a computer.
Setting the Interface
Before first using, the RS232 parameters for the interface need
to be set using the DIL switches inside the Interface housing.
The baud rate, data format and handshake procedure need to
be set to the values which the connected peripheral uses.
The DIL switch settings can be found in the following table:
baudrate
SW2
SW3
SW4
SW5
150
ON
ON
off
off
hardware
off
300
off
off
ON
off
XON/XOFF
ON
600
ON
off
ON
off
1200
off
ON
ON
off
parity
2400
ON
ON
ON
off
no
off
off
4800
off
off
off
ON
odd
off
ON
9600
ON
off
off
ON
even
ON
ON
19200
off
ON
off
ON
38400
ON
ON
off
ON
data bit
76800
off
off
ON
ON
7
off
8
ON
Subject to error and alteration
handshake
SW1
SW7
SW8
SW 6
21
W&T
Centronics > Serial Interfaces
Pin assignments for the RS232 interface
The RS232 interface is implemented as a DB25 male with DTE
configuration. The pin configuration is shown in the following
table:
pin#
funktion
2
data output (TxD)
3
XON/XOFF input (RxD)
5
handshake input (CTS)
7
signal GND
Pin assignments for the Centronics interface
The RS232 interface is implemented as a 36-pin Centronics
female. The pin configuration is shown in the following table:
pin#
1
2..9
strobe
data 0 .. data 7
10
acknowledge
11
busy
12
paper empty (LOW)
13
select (High)
14
auto linefeed (n.c.)
16
signal GND
17
chassis GND
18
(n.c.)
19..30
22
function
signal GND
31
init (n.c.)
32
error (High)
36
select in (n.c.)
W&T
Centronics > Serial Interfaces
Connecting the Interface
The Interface has a Centronics input and an RS232 output.
Centronics interface
The Centronics input of the Interface corresponds in its wiring
and signal characteristics to the input of a parallel printer. This
means that any normal printer cable permitting connection of
the data source with a Centronics printer can be used to
connect the Interface input to the data sender.
RS232 interface
Since peripherals also as a rule have RS232 ports configured as
DTE, the connection between the Interface and the peripheral
can usually be made using a serial printer cable configured as
follows:
Interface
3
2
20
7
5
6
Printer
data
data
handshake
signal GND
handshake
2
3
5
6
7
20
Supply voltage
The Interface is powered using the supplied AC adapter. The
adapter provides a regulated voltage of 5 V ±5%. Commercially
available, unregulated AC adapters are not suitable for powering
the Interface.
Subject to error and alteration
23
W&T
Centronics > Serial Interfaces
Technical Data
Baud rate:
Data format:
Handshake:
Current draw:
Supply voltage:
Input:
Output:
Housing:
Weight:
Scope of delivery:
24
150 .. 76800 baud
7,8 data bits, No,Even,Odd Parity
DTR- and XON-/XOFF - Handshake
approx. 60mA
AC adapter provided
36-pole Centronics female
incl. 0.5 m connection cable on the
device
25-pin SUB-D male in housing
Plastic enclosure, 124x74x21 mm
425 g incl. AC adapter
1x Interface Centronics > RS232
1x AC adapter for office use
W&T
Centronics > Serial Interfaces
Interface Centronics > RS422, Model 26000
Function
The W&T-Interface 26000 allows uni-directional connection of
peripherals equipped with an RS422 port to the parallel port on
a computer.
Setting the Interface
Before first using, the RS422 parameters for the interface need
to be set using the DIL switches inside the Interface housing.
The baud rate, data format and handshake procedure need to
be set to the values which the connected peripheral uses.
The DIL switch settings can be found in the following table:
baudrate
SW2
SW3
SW4
SW5
150
ON
ON
off
off
hardware
off
300
off
off
ON
off
XON/XOFF
ON
600
ON
off
ON
off
1200
off
ON
ON
off
parity
2400
ON
ON
ON
off
no
off
off
4800
off
off
off
ON
odd
off
ON
9600
ON
off
off
ON
even
ON
ON
19200
off
ON
off
ON
38400
ON
ON
off
ON
data bit
76800
off
off
ON
ON
7
off
8
ON
Subject to error and alteration
handshake
SW1
SW7
SW8
SW 6
25
W&T
Centronics > Serial Interfaces
Pin assignments for the RS422 interface
The RS422 Interface is implemented as a DB25 male with DTE
configuration. The pin configuration is shown in the following
table:
pin#
1
function
Shield
10
Data Out A (-)
11
Data In A (-)
14
Signal GND
17
Handshake In A (-)
18
Handshake In B (+)
22
Data Out B (+)
23
Data In B (+)
Pin assignments for the Centronics interface
The Centronics interface is implemented as a 36-pin Centronics
female. The pin configuration is shown in the following table:
pin#
1
2..9
strobe
data 0 .. data 7
10
acknowledge
11
busy
12
paper empty (LOW)
13
select (High)
14
auto linefeed (n.c.)
16
signal GND
17
chassis GND
18
(n.c.)
19..30
26
function
signal GND
31
init (n.c.)
32
error (High)
36
select in (n.c.)
W&T
Centronics > Serial Interfaces
Connecting the Interface
The Interface has a Centronics input and an RS422 output.
Centronics interface
The Centronics input of the Interface corresponds in its wiring
and signal characteristics to the input of a parallel printer. This
means that any normal printer cable permitting connection of
the data source with a Centronics printer can be used to
connect the Interface input to the data sender.
RS422 Interface
Information regarding connecting the RS422 Interface can be
found in the following wiring examples:
RS422 hardware handshake application
Centronics
10
22
11
23
17
18
RxD A (-)
RxD B (+)
TxD A (-)
TxD B (+)
DTR A (-)
DTR B (+)
RS422
device
PC
26000
RS422
DOut A
DOut B
DIn A
DIn B
HIn A
HIn B
RS422 software handshake application
Subject to error and alteration
DOut A
DOut B
DIn A
DIn B
10
22
11
23
RxD A (-)
RxD B (+)
TxD A (-)
TxD B (+)
RS422
device
RS422
26000
PC
Centronics
27
W&T
Centronics > Serial Interfaces
Supply voltage
The Interface is powered using the supplied AC adapter. The
adapter provides a regulated voltage of 5 V ±5%. Commercially
available, unregulated AC adapters are not suitable for powering
the Interface.
Technical Data
Baud rate:
Data format:
Handshake:
Current draw:
Supply voltage:
Input:
Output:
Housing:
Weight:
Scope of delivery:
28
150 .. 76800 baud
7,8 data bits, No,Even,Odd Parity
DTR- and XON-/XOFF - Handshake
approx. 110mA
AC adapter provided
36-pole Centronics female
incl. 0.5 m connection cable on the
device
25-pin SUB-D male in housing
Plastic enclosure, 124x74x21 mm
425 g incl. AC adapter
1x Interface Centronics > RS422
1x AC adapter for office use
W&T
Centronics > Serial Interfaces
Interface Centronics > RS422, Model 24000
Function
The W&T-Interface 24000 allows uni-directional connection of
peripherals equipped with a 20mA port to the parallel port on a
computer.
Setting the Interface
Before first using, the 20mA parameters for the interface need
to be set using the DIL switches inside the Interface housing.
The baud rate, data format and handshake procedure need to
be set to the values which the connected peripheral uses.
The DIL switch settings can be found in the following table:
baudrate
SW2
SW3
SW4
SW5
handshake
SW1
150
ON
ON
off
off
XON/XOFF
ON
300
off
off
ON
off
600
ON
off
ON
off
parity
1200
off
ON
ON
off
no
off
off
2400
ON
ON
ON
off
odd
off
ON
4800
off
off
off
ON
even
ON
ON
9600
ON
off
off
ON
19200
off
ON
off
ON
data bit
SW7
SW8
SW 6
7
off
8
ON
The speeds 38.4 kBaud and 78.6 kBaud can in principle be set
on the DIL switches, but correct function of the Interface
cannot be guaranteed in these modes.
Subject to error and alteration
29
W&T
Centronics > Serial Interfaces
Pin assignments for the 20mA interface
The 20mA Interface is implemented as a DB25 male. The pin
configuration is shown in the following table:
pin#
function
12
Data In (XON/XOFF) +
13
Data Out -
14
Signal GND
24
Data In (XON/XOFF) -
25
Data Out +
Pin assignments for the Centronics interface
The Centronics interface is implemented as a 36-pin Centronics
female. The pin configuration is shown in the following table:
pin#
1
2..9
strobe
data 0 .. data 7
10
acknowledge
11
busy
12
paper empty (LOW)
13
select (High)
14
auto linefeed (n.c.)
16
signal GND
17
chassis GND
18
(n.c.)
19..30
30
function
signal GND
31
init (n.c.)
32
error (High)
36
select in (n.c.)
W&T
Centronics > Serial Interfaces
Connecting the Interface
The Interface has a Centronics input and a 20mA output.
Centronics interface
The Centronics input of the Interface corresponds in its wiring
and signal characteristics to the input of a parallel printer. This
means that any normal printer cable permitting connection of
the data source with a Centronics printer can be used to
connect the Interface input to the data sender.
20mA Interface
Information regarding connecting the 20mA Interface can be
found in the following wiring examples:
Data input active
Data output active
S2.1 = "ON"
S2.2 = "ON"
+5V
+5V
IN+ 12
OUT+ 25
IN- 24
OUT- 13
GND 14
GND 14
Interface 24000
Interface 24000
Data output passive
Data input passive
S2.2 = "OFF"
S2.1 = "OFF"
+5V
+5V
OUT+ 25
IN+ 12
+
IN- 24
OUT- 13
Interface 24000
Subject to error and alteration
Interface 24000
31
W&T
Centronics > Serial Interfaces
Supply voltage
The Interface is powered using the supplied AC adapter. The
adapter provides a regulated voltage of 5 V ±5%. Commercially
available, unregulated AC adapters are not suitable for powering
the Interface.
Technical Data
Baud rate:
Data format:
Handshake:
Current draw:
Supply voltage:
Input:
Output:
Housing:
Weight:
Scope of delivery:
32
150 .. 19200 baud
7,8 data bits, No,Even,Odd Parity
DTR- and XON-/XOFF - Handshake
approx. 50mA
AC adapter provided
36-pole Centronics female
incl. 0.5 m connection cable on the
device
25-pin SUB-D male in housing
Plastic enclosure, 124x74x21 mm
425 g incl. AC adapter
1x Interface Centronics > 20mA
1x AC adapter for office use