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Code:XPNDR 1 DEC 66458 XPNDR 1 INC 65654 XPNDR 10 DEC 66457 XPNDR 10 INC 65653 XPNDR 100 DEC 66456 XPNDR 100 INC 65652 XPNDR 1000 DEC 66455 XPNDR 1000 INC 65651 XPNDR DEC CARRY 66459 XPNDR INC CARRY 66460 XPNDR SET 65715
Code:0354 2 Transponder setting, 4 digits in BCD format: 0x1200 means 1200 on the dials.
So if the numbers of the front panel with the rotary switches are "hard wired", it no longer needs synchronization, they are sync'd.
I think, in the original, the switches are controlled by photocells and the last value is saved when the device is switched off.