I have added support for the Yokogawa 7555 (both versions) in Type 0 : 7552 compatibility mode
Furthermore I have done some extending functions of the meter and bug fixing of my Yokogawa 755x and 756x definition, so changelog is long:
Added: Math tab with dB Reference (dBV, dBµV, dBmV, 600, 75 and 50 Ohm), dB Multiplier for KC, Logic Family (TTL/HCT, LVTTL 3V3, CMOS, RS232) with CMOS Vdd, and Scaling Mode (Nominal, Deviation, Shunt) with Nominal Value;
Added: Computation tab holding the constants, Math status and function, split off the Math tab;
Added: IC Card status, Definition version and IC Card support level on the System tab;
Added: Support for the Yokogawa 7555 (RS232/GPIB) in Type 0 : 7552 compatibility mode
Fixed: Reset all Constant values did not reset KA, the scpiCmd was missing none so the first :setvar: was consumed as the action;
Fixed: dataHeadVal decoding read only 3 positions;
Fixed: daOutputVal not assigned the decoded value;
Fixed: IC Card and Front/Rear detection now ignore status bit 4, which is CARD BUSY on the 7563;
Fixed: OSLINESVAL set to 12 for 7563 and addional temperature constants are skipped/ignored, Decibel functions gated due to Not Supported
Modified: renamed to Yokogawa 755x 756x.txt to cover the whole series;
Modified: unit suffix for Ohm_2W, Ohm_4W, freqACV and freqACA on radio range buttons;
Modified: IC Card status now reads Inserted / Not Inserted;
Modified: constMax renamed CONSTMAXVAL and the OS line count moved to OSLINESVAL;
Modified: Constant KD no longer forced into the meter's native format, which the dBµV and dBmV references need;
The new math screen has functions that the meter does not offer, but can be supported in a user friendly manner. TestController can be use to extend functionality of a meter and I use this method often not stopping of just making functions available 1:1.

The 7563 should now also work better since I got the details from a Japanese manual
HKJ
- please
delete Yokogawa 7551-7552.txt from your release
- please
add Yokogawa 755x 756x.txt to the next release
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Part of TC