CAT answer on ZZFB; command with Slice A only

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What the CAT answer should be on ZZFB; command with Slice A only  - one Pan one Slice
today it looks like (SSDR 2.1.33) :


5A 5A 46 42 3B              ZZFB;
       22:46:42 PM Read: 
3F 3B                       ?;


but  questionmark " ? "  is not documented in CAT User Guide with ZZFB command
What should be "as designed" ?
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Sergey, R5AU

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Posted 5 months ago

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Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

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Official Response
The "?" means the command was not understood or it is not applicable for the slice it was sent to.

All VFO "B" commands will return a "?" unless the radio has been put into SPLIT mode by issuing the ZZSW1: command.  When in split mode, the radio automatically create the VFO B slice (you cannot create it manually).  And all VFO B CAT commands sent to the VFO A (parent) slice will respond appropriately. 

Programs that support split only have one CAT port, so both VFO A and VFO B CAT commands are sent to one and only one CAT port.  

To take the radio out of split, issue the ZZSW0; command.