saia-pcd.com
197
Server
Client
20
Data
21
Cmd
1026
Cmd
1027
Data
1
2
3
4
FTP
1
SBC Software
3
SBC S-Web Technology
2
Communication &
interaction
Communication & interaction
Ethernet
IP protocols
PPP
RS-232
Flash cards
File system
The File Transfer Protocol (FTP) is used to load files into or read files from PCD devices via the network. Files (websites, log data,
documents, etc.) are stored in the PCD device’s file system. User groups and passwords can be set up to protect access to the FTP server
and individual files (e. g. read only).
PG5 device configurator settings
`
Activating/deactivating the FTP server
`
Configuring port numbers (standard port: 21),
user and access rights
`
Advanced settings (no. of connections, timeout, etc.)
Active/passive FTP mode
PCD devices only support the active connection mode!
The client establishes a connection to server port 21
and provides the server with the port number for the data channel.
In contrast to passive mode (where the data channel port is always
20), this port number is not preset and can be > 1023. This often
causes problems with firewalls since these port numbers are not
approved.
Another means of transferring files is to use FTP-CGI (Common
Gateway Interface) interfaces in the web server. Knowing
the respective syntax, it is also possible to transfer data between
a web client and PCD devices via this interface. For more information
on this please refer to Chapter B2 S-Web
.
FTP: Protocol for transferring files
Internet
Intranet
Telecom
Technical data
FTP standard
RFC 959
Standard port number
21 (can be adjusted) plus dynamic port (>1023) for data
Connection mode
PCD devices only support the active FTP mode
Number of FTP connections per PCD Standard 3 (max. 5 adjustable)
Interfaces
Ethernet, serial RS-232 with PPP
