Monarch Instrument DC6000 - Manual (Page 85)

Section 5 – Recorder Setup
I.
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1/06/2012 REV 1.10.2
5.7.2.4 FTP Server Enable
Check this checkbox to allow the use of FTP (File transfer) remotely. Uncheck this box to disable the use
of remote FTP for security reasons
5.7.2.5 Modbus Settings
This is only applicable if the serial port option is installed in the unit or if Modbus
TCP is to be used. Modbus is a communication protocol which runs over RS232
(single unit), RS485 (multiple units) or Ethernet TCP. The ID uniquely identifies the
device in a multidrop environment and can be set from 1 to 255. Note that this
does not imply that 255 units can be on line at a time. The limit is usually 32 to 64 for serial connection.
The Baud Rate is the serial communication speed which must match that of the host controller. This can
be set from 9600 to 115200 baud. The ID and baud rate do not affect the Modbus TCP
– Ethernet –
connection. The timeout is the amount of time the device will wait before disconnecting and releasing the
line. It should be set for 2 to 5 seconds
5.7.2.6 NTP Time Server
NTP is Network Time Protocol. The Recorder has the ability to go out over the
internet and get a time update from one of several NTP time servers if the Time
Server Checkbox is checked.
Note that you DO NOT NEED to use this unless you want to synchronize a number of units spread about
on different networks. The unit will connect and synchronize to any network server it finds on the Ethernet
at startup time.
There needs to be a valid IP address for NTP to work in the IP entry box. A list of NIST Internet Time
Servers can be found at (among others)
http://tf.nist.gov/service/time-servers.html . If the Time Server
Enable box is checked the unit will synchronize its time at startup and every 12 hours thereafter. Note:
The NTP setting is only recognized at start up. It is necessary to
Save the Configuration and restart the
unit (you can, with caution use the reset button .)
5.7.2.7 Unit Tag
The Unit Tag identifies the recorder. It appears in the task bar and all data files. Enter up to 22
characters. The unit tag is “Process Recorder” in the figure
above .
5.7.2.8 Menu Timeout
The Menu Timeout sets the time in seconds after which any menu visible on the screen will collapse and
the display will revert back to the live display. Select 60 to 300 seconds from the dropdown box.
5.7.2.9 50/60 Hz Filter
In noisy environments the AC mains frequency interference can affect the readings on the most sensitive
(millivolt) ranges when running at sample rates asynchronous to the AC mains frequency. If the sample
rate can be made to run synchronously with the AC mains frequency, the noise effect of that frequency is
minimized because the recorder has differential inputs and samples at the same place on AC wave for
every sample. This does however place a limit on what the sample rates can be. The common
denominator for 50 and 60 Hz is a sample rate of 16.66 samples per second to eliminate the AC hum.
This means that the fastest sample rate to meet this requirement is around 1.5 to 2.2 samples per second
depending on the number of analog input channels in the recorder. Checking the box will activate the filter
but will limit the maximum sample rate irrespective of what is selected elsewhere. This is usually not an
issue for thermocouples and RTDs which are typically the most affected by AC noise.