WERMA SIGNALTECHNIK Version 1.2.0 - 0911 15
6. Operation with Dynamic Link Library (DLL)
6.1 Introduction
The USB terminal element provides connectivity for a signal tower to the PC via USB.
The user controls the USB module by using a specified dynamic link library (DLL) file found on
the CD provided with the USB terminal element. The DLL contains several functions to set and
retrieve the light module status.
The control over the light module is generally carried out by a customer application. The
control over the module from the user application is achieved via a specific DLL which shares
all the commonly needed functions. The DLL library is a standard windows functions library
which can be easily used with the most common application development tools such as
Visual Basic, Visual C++ etc.
6.2 Related files and executables
Runtime files:
The DLL Library should reside in a file located in the same folder with user project .EXE file. This
file communicates with the USB module.
slma.dll Contains functions which provide control over the USB module
6.3 DLL Functions
6.3.1 Function Overview
1
Please note that Linux, Mac OS X and Windows CE do not support location IDs.
2
Please note that these two functions cover the further functions (see next page).
Basic Functions
SetUsbDevice Returns the number of devices currently found in the system
SetDeviceStatus
2
Sets the status (ON, OFF, Blinking mode 1, Blinking mode 2) for all
Outputs
GetDeviceStatus
2
Gets the current Output status (ON, OFF, Blinking mode 1, Blinking
mode 2) for all Outputs
GetDeviceSerial Gets the specified device serial code
GetDeviceLocation
1
Gets the Location ID of the USB port, where the device is connected
GetFirmwareVersion Gets the specified device firmware version
GetLibVersion Gets the currently used library version
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