Q.seriesGantner Instruments GmbH 214 Connecting the modules → Connecting the base4 Connecting the modulesThis chapter contains the description of the connection variantsand pin assignments.4.1 Connecting the baseThe base is used for supplying the current and voltage to themodule, for synchronization and for the transfer of data. Themodule is also electrically connected to the mounting rail (DIN35 mm rail according to DIN EN 60715) by means of a metalspring in the base. In addition, you can activate the terminatingresistances for the interface at the end of the cable, save themodule configuration in the base and define the restoration ofthis configuration when inserting a new module.First, set the DIP switches in the base to the required position(4.1.2 to 4.1.3). Then plug the base on and push on further basesfrom the right (4.1.4). The power is supplied from the left sidewhich also provides a direct connection to the PC or PLC if youare not using any Q.gate or Q.pac.IMPORTANTThe end of the interface line must be terminated with two resis-tances. Otherwise reflections occur on the line and lead to distur-bances, even to the loss of data transmission. Refer toSection 4.1.3, Activating the terminating resistances, page 24.You can operate the bases in various modes:• Unconfigured, i.e. the modules are fully configured via a PCand software.• With address configuration, i.e. the address of the modules isset via the base and all the rest of the configuration takesplace via a PC. An address set by software is not taken intoaccount in this case.• With boot configuration (factory setting), i.e. a module can bereplaced at any time by one of the same type (hot swap). Theconfiguration data are saved in the base and are automati-cally loaded into the module when it is inserted. This meansyou can continue with your measurement without further con-figuration work. Saving the necessary data in the base occursautomatically via the configuration software test.commander.Configuring the operatingmodeThe configuration of the operating mode occurs using the DIPswitches in the base (Fig. 4-1). DIP switch 7 is currently notassigned any function and is reserved for later expansions.
