RS-232

Hello, friends. There is a helium leak detector ASM 192 installed in an automated line. The leak detector is controlled by the Siemens S-1500 controller via the RS-232 interface. ACM-192 operates in "Advanced mode" using "long commands". The task was set to replace ASM-192 with ASM-392. But the problem is that the ACM-392 does not respond to "long commands" (both those given by the S-1500 controller and the operator from the PS, in the "Basic mode" mode there is data transfer from the ACM-392 to the PS, which indicates the operability RS-232 interface). Question: how to activate the "Advanced Mode" mode on ACM-392 equipment?

Equipment: Pfifer Vacuum ASM 392