If the instrument has been equipped with the optional RS-232 or RS-485 interface, it can be controlled digitally, e.g. from a PC by PNet control software.
The line should be connected according to Figure 6.2-1. (A resistor of 100 ohms should be connected between both RS-485 lines, if it is not already present. This resistor is not part of MASSFLOW or any other LAMBDA instrument.) When the digital control is activated the REMOTE LED is on and all manual commands (with exception of the SET button) are blocked.
For the MASSFLOW meter (flow measurement only) the measured flow values can be accessed over the RS-protocol as well as the total gas volume, if the internal INTEGRATOR (optional) has been installed.