
Industrial Managed
Ethernet Switch
User Manual
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Label
Description
Factory Default
Offset
Decide how many hours to be shifted
forward/backward when daylight saving time begins
and ends. See note below.
0
Enable SNTP
Enables SNTP
function. See note below.
Unchecked
NTP Server 1
Sets the first IP or Domain address of
NTP Server
.
time
.
nist
.
gov
NTP Server 2
Sets the second IP or Domain address of NTP
Server. Switch will locate the 2nd
NTP Server
if the
1st NTP Server fails to connect
.
time-A.timefreq.bldrdoc.gov
Time Server
Query Period
This parameter determines how frequently the time is
updated from the NTP server. If the end devices
require less accuracy, longer query time is more
suitable since it will cause less load to the switch.
The setting value can be in between 60
–
259200 (72
hours) seconds.
259,200 seconds
Enable NTP
Server
This option will enable network time protocol (NTP)
daemon inside the managed switch which allows
other devices in the network to synchronize their
clock with this managed switch using NTP.
Unchecked
Note:
- Daylight Saving Time
: In certain regions (e.g. US), local time is adjusted during the summer season in order to
provide an extra hour of daylight in the afternoon, and one hour is usually shifted forward or backward
.
- SNTP
:
S
imple
N
etwork
T
ime
P
rotocol is used to synchronize the computer systems
’ clockswith a standard NTP
server. Examples of two NTP servers are
time
.
nist
.
gov
and
time
-
A
.
timefreq
.
bldrdoc
.
gov
.
2.3.9
Modbus Setting
Atop
’s managed switch can be connected to a Modbus network using Modbus TCP/IP protocol which is an industrial
network protocol for controlling automation equipment. The managed switch
’s status and settings can be read and
written through Modbus TCP/IP protocol which operates similar to a Management Information Base (MIB) browser.
The managed switch will be a Modbus slave which can be remotely configured by a Modbus master. The Modbus
slave address must be set to match the setting inside the Modbus master. In order to access the managed switch,
a
Modbus Address
must be assigned as described in this subsection
.
A Modbus memory mapping table, which
lists all the register
’s addresses inside the managed switch and their descriptions, is provide in Chapter 7
2.33 shows the Modbus Setting webpage.
Figure 2.33 Webpage for Setting the Modbus Address
Figure 2.33 shows the webpage that users can set up the Modbus ID address
.
Users can use Modbus TCP
/
IP
compatible applications such as
Modbus Poll
to configure the switch. Note that Modbus Poll can be download from
://www.modbustools.com/download.html
. The Modbus Poll 64
-
bit version 7
.
0
.
0, Build 1027 was used in this