Specifications

PERFORMING DOWNLOADS
Download Content
VX 520 R
EFERENCE GUIDE 101
DDL.EXE is a Windows program included in the Verix V DTK (Verix V
Developer’s Toolkit).
Download
Content
In general, you can download files and data to a VX 520 terminal. The types of
files and data can be grouped into the following functional categories:
• Operating system files: A set of related programs and data files provided by
VeriFone to control the terminal’s basic processes and functions. Files that
belong to the OS are stored in a reserved area of the terminal memory.
A complete OS is downloaded to each VX 520 terminal during the
manufacture. If necessary, download newer versions during application
development, or when preparing for deployment to on-site terminals.
• Applications and related files: An application is a computer program
consisting of one or more executables, including compiled and linked object
files (*.out), and one or more function libraries (*.lib). Most applications
also include font files (*.vft, *.fon), data files (*.dat), and other related
file types.
VX 520 applications can be developed by VeriFone, customers, or third
parties on customer request. One or more applications must be downloaded
to the VX 520 terminal before it can be deployed at a customer site and used
to process transactions.
• Files related to file authentication: The logical component of the VeriShield
security architecture in the VX 520 terminal is file authentication. For an
executable to run on a VX 520 terminal, it must be authenticated by the
VeriShield file authentication module.
Two special types of files are required for the file authentication process:
digital certificates (*.crt) and signature files (*.p7s). These file types must
be downloaded to the terminal together with the application files to
authenticate.
• Terminal configuration settings: Files or records that contain various types
of data can also be downloaded to a VX 520 terminal, including CONFIG.SYS
variables, passwords for accessing protected terminal manager functions, the
current date and time, and the modem country code setting (refer to
Chapter 4).
NOTE
No special software tool or utility is required to perform back-to-back application
downloads. Only a serial cable connected between two terminals is required.
This data transfer procedure, invoked from within terminal manager, is handled
by the OS software and firmware of the sending and receiving VX 520 terminals.
NOTE
For details on file authentication, see Chapter 5.