Metrohm 847 Lab Link - Manual (Page 17)

2 Installation
low: No detailed recording is made. This is recommended for normal
operation.
medium: All received and transmitted commands as well as the periodic
status tests are recorded. This is normally sufficient for tracing communi-
cation problems.
high: In addition, technical programming information is recorded. This is
only for debugging, in cooperation with Metrohm service staff.
Note
Keep the log file level as low as possible in order to avoid unnecessary
CPU and memory occupancy.
Additional debug switches are set with the parameter Log file parts. This
parameter is only required by Metrohm service staff.
2. Under Periodic status test define at which intervals the defined Lab
Link connections are to be checked.
Standard value: 25 s, Input range: 5 ... 50 s
The Lab Link Server performs this status test in the above defined interval
for:
–
all connections with status connected
–
connections with status not available, for which the option
Auto connect (via multicast) is deactivated
The status test consists of an ICMP (Internet Control Message Protocol
= "Ping") request to the corresponding TCP/IP address. A short cycle pe-
riod enables a rapid reaction to status changes, but subjects the network
to slightly greater traffic. A long cycle period lengthens the reaction time
to a newly switched-on Lab Link device with deactivated option Auto
connect (via multicast), but results in less network traffic. The time must
be selected so that the Lab Link Server program always has the opportu-
nity of opening the TCP/IP connection to newly switched-on hardware be-
fore the Titrando system terminates the setting up of a connection to the
Lab Link Server. At the earliest, the connection setup takes place 25 sec-
onds after switch-on and is terminated after 50 seconds at the latest with
an error message if no connection is made within this time. The following
equation can be used as an aid for calculating the optimal time:
Calculation of the Periodic status test time
= 42 s – (number of defined connections * ICMP timeout)
3. With Remote LCD refresh interval you can define at what time interval
the remote control display is to be updated (see also Section 3.5 Remote
service).
Standard value: 10 s, Input range: 0 and 3 ... 600 s.
847 USB Lab Link / Lab Link Server 13