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saia-pcd.com
SNTP-Server
Ethernet
Client
SNTP
RTC
Saia
PCD®
Reset SNTP
―Res
Busy―
Error―
Status―
Status SNTP
―En StatSNTP―
LifeBit―
CSAddr―
LST―
Error―
Status―
Communication & Interaction
FBoxes
The status of the SNTP function can be read and/or reset using specific FBoxes.
HTTP: Protocol for accessing the PCDWeb Server
PG5 device configurator settings
Activating/deactivating the HTTP port
Advanced settings (buffer, sessions, keep alive timeout, etc.)
Technical data
HTTP standard
1.0 and 1.1 (RFC 2616)
2 adjustable listener ports
Standard 80 and 81
Number of sessions
8 parallel with keep alive (standard setting, max. 32 adjustable)
Interfaces
Ethernet, serial RS-232 with PPP, the HTTP protocol can also be encapsulated in the S-Bus and therefore used via
other interfaces such as USB. Please refer to chapter B3 S-Web technology for details
Hypertext Transfer Protocol (HTTP) is a protocol used for trans-
ferring data over a network. With Saia PCD®s, the protocol is
used for accessing the PCD web server.
SNTP: Simple Network Time Protocol
The Simple Network Time Protocol is a standard used to
synchronise the time across several devices in IP networks.
The protocol enables the transmission of the current time of
servers in the Internet or Intranet.
Sophisticated algorithms ensure that the different run times
are balanced out across a network.
The internal system clocks (RTC) and the changeovers
between summertime and wintertime are synchronised
automatically for all network participants at the same time.
Standard
RFC-2030
Port
UDP 123
SNTP mode
Unicast point-to-point (SNTP client initiates a time request) Broadcast point-to-point (the time is sent from
the NTP server simultaneously to all clients)
Time format
UTC (Greenwich Mean Time), adjustable time zone
Timing accuracy
500 ms for Unicast point-to-point 1 s for Broadcast point-to-point (without run time correction)
Request interval
10 s
Interfaces
Ethernet or serial RS-232 via PPP
Websites
PCD data
Ethernet
IP protocols
PPP
HTTP
RS-232
Internet
Intranet
Telecom
Internet
Intranet
