Interface, Device Address, And Networking; Baud Rate, Data Format; Atmospheric Pressure Compensation And Temperature Compensation - Ahlborn ALMEMO 2590-2A Operating Instructions Manual

14. Device configuration

14.4 Interface, device address, and networking

Via the serial interface you can output cyclic data
logs, all function values from the measuring
menus, and all the programming details for the de-
vice and for the sensors to a computer (see Man-
ual, Ch 6). For connecting to the various Interfaces
we have a series of data cables available; (see
15.1, Manual 5.2). All ALMEMO ® devices
can also be networked together very easily thus enabling the user to centrally
acquire and record measured values from several measuring instruments -
even if these are located far apart (see Manual 5.3). To communicate with net-
worked devices it is absolutely indispensable that each device should have its
own baud rate setting and its own dedicated address; this is because only one
device should respond per command. Before starting network operation ensure
therefore that all the measuring instruments involved are assigned different de-
vice addresses. For this purpose use the function . On leaving
Device address
the factory address 00 is normally set. This can be modified as desired by
means of the usual data entry procedure (see 9.5).

14.5 Baud rate, Data format

On leaving the factory the baud rate for all interface modules is programmed to
9600 baud. In order to avoid unnecessary problems when networking several
devices together the baud rate should not be altered; rather the computer should
be set to match. If this is for some reason not possible you can, in the Baud rate
function, enter the values 1200, 2400, 4800, 9600 baud or 57.6, 115.2 kbaud
(paying attention not to exceed the maximum baud rate for the interface module
in question). The baud rate setting is saved in the EEPROM on the interface
module and thus applies when used with any other ALMEMO device.
To set the baud rate in function (see 9.5):
Baud rate: 9600 bd
Data format: (setting cannot be changed) 8 data bits, 1 stop bit, no parity
14.6 Atmospheric pressure compensation and tempera-
ture compensation
Atmospheric pressure and temperature can both be set to compensate certain
sensors (see 11.2.5, 11.2.4). If these parameters are measured, the correspond-
ing measured values are also shown here :
Enter atmospheric pressure in function (see 9.5): Atm pressure : 1013 mbar
Enter compensation temperature in function : Temp comp : CT 31.0°C
The cold junction temperature is used to compensate thermocouple meas-
urement :
Cold junction temperature = socket temperature : CJ temperature :25.4°C
66