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PRODUCT INFORMATION
PC PARALLEL PORT TO OS-LINK INTERFACE
ST20-PPI
42 1679 00
January 1996
FEATURES
Desktop mounted parallel port to differential
OS-Link interface
Standard 25 way D-type parallel port connec-
tion
Standard 26 way D-type differential OS-Link
connection
Plug top power supply
Supports nibble, byte and EPP mode parallel
port standards
DESCRIPTION
The ST20-PPI parallel port to OS-Link interface is
a host interface to allow connection from a PC par-
allel port to any OS-Link based ST20 development
board such as the ST20450-SAB. The interface
plugs into any standard PC 25 way D-type parallel
port. Supported parallel port modes are:
Nibble mode
Byte mode
EPP mode
depending on which mode the host PC can sup-
port. Connection to the development target is via a
differential OS-Link connector, as used on the IMS
B300 and ST20450-Development Board. Once
connected, the development target can be ac-
cessed with the standard ST20 Toolset using the
MS Windows drivers supplied.
ST20-PPI PC Parallel Port to OS-Link Interface
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1
Introduction
The ST20-PPI parallel port to OS-Link interface is a host interface to allow connection
from a PC parallel port to any OS-Link based ST20 development board such as the
ST20450-SAB. The interface plugs into any standard PC 25 way D-type parallel port.
Supported parallel port modes are:
Nibble mode
Byte mode
EPP mode
depending on which mode the host PC can support. Connection to the development
target is via a differential OS-Link connector, as used on the IMS B300 and ST20450-
Development Board. Once connected, the development target can be accessed with
the standard ST20 Toolset using the MS Windows drivers supplied.
2
Installation
2.1
Hardware Installation
The ST20-PPI has three connections: Parallel port; Differential OS-Link and Power
supply. To install the hardware, the following steps should be followed:
Plug the 25-way D-type of the parallel port cable built into the interface, into the
parallel port of the PC
Plug the target development system into the 26-way D-type using a differential
OS-Link cable or the differential-to-single ended cable depending on the link
interface available on the target board
NOTE: To comply with EMC regulations this cable must use shielded cable
with shielded headshells at either end.
Plug power supply cable into PSU socket of the interface
Plug the power supply into the mains socket.
Switch on the PC
Switch on the power supply. The power LED on the interface should illuminate
when the power supply is switched on
ST20-PPI PC Parallel Port to OS-Link Interface
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Figure 2.1 ST20-PP1 connections
2.2
Software Installation
For installation of the DLL and VxD drivers, please refer to the ST20 Toolset software
installation documentation.
ST20-PPI
Development
Target e.g.
PC
Differential
Cable
ST20450-SAB
To mains
adaptor
Parallel port
cable
ST20-PPI PC Parallel Port to OS-Link Interface
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3
Connectors
3.1
Differential Link Connector
Table 3.1 26 way D-type connector
3.2
Power Supply Connector
The ST20-PPI uses a 2.5mm power connector. The voltage range is 8-13V dc.
Pin
Description
Pin
Description
1
+notSSDownReset
14
GND
2
+notSSDownAnalyse
15
GND
3
+notSSDownError
16
GND
4
+notSSUpReset
17
GND
5
+notSSUpAnalyse
18
GND
6
+notSSUpError
19
-notSSDownReset
7
+LinkOut
20
-notSSDownAnalyse
8
+LinkIn
21
-notSSDownError
9
GND
22
-notSSUpReset
10
GND
23
-notSSUpAnalyse
11
GND
24
-notSSUpError
12
GND
25
-LinkOut
13
GND
26
-LinkIn
GND
+V
ST20-PPI PC Parallel Port to OS-Link Interface
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3.3
Parallel Port Connector
Table 3.2 Parallel port connector pinout
4
Field Support
SGS-THOMSON Microelectronics Limited products are supported worldwide through
Sales Offices and authorized distributors.
5
Ordering information
Table 5.1 Ordering information
Pin
Description
Pin
Description
1
notWRITE
10
D3-D7
2
D0
11
notWAIT
3
D1
12
D2-D6
4
D2
13
D1-D5
5
D3
14
notDATA
6
D4
15
D0-D4
7
D5
16
notINIT
8
D6
17
notADDR
9
D7
18..25
Ground
Description
Order Number
ST20-PPI Parallel Port to OS-Link Interface (US)
ST20-PPI/110
ST20-PPI Parallel Port to OS-Link Interface (European)
ST20-PPI/220
ST20-PPI Parallel Port to OS-Link Interface (UK)
ST20-PPI/UK
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