Technical data

190 • Fieldbus Communication
ETHERNET
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Command Function
NLST Gives the directory list
RMD Deletes directory
PWD Gives the actually path
MKD Puts on a directory
The TFTP (Trivial File Transfer Protocol) is not supported by some of the
couplers/controllers.
Additional Information
You can find a list of the exact available implemented protocols in the chap-
ter "Technical Data" to the fieldbus coupler and/or controller.
4.1.3.3.7 SMTP (Simple Mail Transfer Protocol)
The Simple Mail Transfer Protocol (SMTP) enables sending of ASCII text
messages to mail boxes on TCP/IP hosts in a network. It is therefore used for
sending and receiving e-mails.
The e-mail to be sent is created with a suitable editor and placed in a mail out
basket.
A send SMTP process polls the out-basket at regular intervals and therefore
finds mail waiting to be sent. It then establishes a TCP/IP connection with the
target host, to which the message is transmitted. The receive SMTP process on
the target host accepts the TCP connection. The message is then transmitted
and finally placed in an in-basket on the target system. SMTP expects the tar-
get system to be online, otherwise no TCP connection can be established.
Since many desktop computers are switched off at the end of the day, it is im-
practical to send SMTP mail there. For that reason, in many networks special
SMTP hosts are installed in many networks, which are permanently switched
on to enable distribution of received mail to the desktop computers.