Principles of Operation87Synchronizing Acquisition on Multiple DT9837A,DT9837B, or DT9837C ModulesDT9837A, DT9837B, and DT9837C modules provide an RJ45 (LVDS) synchronizationconnector that you can use to connect and synchronize multiple DT9837A, DT9837B, orDT9837C modules. In this scheme, one module is the master and the other modules are theslave. You specify the synchronization mode (master, slave, or none) of the RJ45 connectorusing software.When configured as a master, the RJ45 synchronization connector outputs trigger and clocksignals. When configured as a slave, the RJ45 connector accepts trigger and clock signals fromthe master; you cannot use the Ext Trig connector or the analog threshold trigger on the slavemodule in this configuration. When configured as none (the default mode), the DT9837A,DT9837B, or DT9837C module uses the USB clock instead of the RJ45 synchronizationconnector. The synchronization mode remains set until changed or until the application exits.You can connect multiple modules in one of two ways. Figure 25 shows how to connect amaximum of two DT9837A, DT9837B, or DT9837C modules by daisy chaining them togetherthrough the RJ45 connector. Figure 26 shows how to connect a maximum of four DT9837A,DT9837B, or DT9837C modules by using an RJ45 distribution panel, such as the EP386, wherethe panel contains four RJ45 connectors that are wired in parallel.Note: You must have revision H or later of the DT9837A module or revision F or later of theDT9837A-OEM module to be able to attach four modules together. You can identify therevision of your module by looking at the serial number label on your module.If you have revision G or earlier of the DT9837A or revision E or earlier of theDT9837A-OEM, you can attach a maximum of two modules together.
