
CAT System Computer Control
Opcode Command Chart (1)
  | Command  | Parameter Bytes  | Opcode  | Parameter Description  | 
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  | or Key  | 1st  | 2rd  | 3rd  | 4th  | 5th  | 
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  | SPLIT  | –  | –  | –  | T  | 01H  | Split Tx/Rx operation ON (T = 01H) or OFF (T = 00H)  | 
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  | Recall  | –  | –  | –  | X  | 02H | Recalls memory number X: 01H ~ 71H, corresponding to  | 
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  | Memory  | memories 1 ~ 99, P1 ~ P9, and QMB 1 ~ QMB 5.  | 
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  | VFO/MEM  | –  | –  | –  | X  | 03H | Enter (K = 00H), Mask (K = 01H) or   | 
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  | memory channel X (01H ~ 71H).  | 
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  | Tuning knob Lock/Unlock:  | 
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  | LOCK  | –  | –  | –  | P  | 04H  | P = 00H: Main Dial Lock  | P = 01H: Main Dial Unlock  | 
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  | P = 02H: Sub Dial Lock  | P = 03H: Main Dial Unlock  | 
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  | A/B  | –  | –  | –  | V  | 05H  | Select   | 
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  | [MuB]  | –  | –  | –  | X  | 06H  | Copy memory X (01H ~ 71H) to   | 
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  | UP (p)  | –  | –  | U  | V  | 07H  | Step   | 
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  | by 100 kHz/1 MHz (U = 00H/01H).  | 
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  | DOWN (q)  | –  | –  | D  | V  | 08H | Step   | 
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  | by 100 kHz/1 MHz (D = 00H/01H).  | 
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  | Clarifier offset direction & frequency in BCD  | 
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  | C1 = Hz offset  | (C1 = 00H ~ 99H)  | 
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  | C2 = kHz offset  | (C2 = 00H ~ 09H)  | 
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  | CLAR  | C1  | C2  | C3  | C4  | 09H | C3 = Hz offset  | (C3 = 00H/FFH)  | 
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  | Clarifier On/Off/Reset:  | 
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  | C4 = RX CLAR ON/OFF (C4 = 00H/01H)  | 
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  | TX CLAR ON/OFF (C4 = 80H/81H)  | 
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  | CLAR CLEAR  | (C4 = FFH)  | 
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  | Set Main  | 
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  | New operating frequency in BCD format (F1 ~ F4)  | 
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  | see text for formatting example.  | 
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  | Operating Freq.  | 
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  | Select Operating Mode M:  | 
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  | LSB: M = 00H  | USB: M = 01H  | CW: M = 02H  | 
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  | MODE  | –  | –  | –  | M  | 0CH | CW (R): M = 03H  | AM: M = 04H  | AM(Sync): M = 05H  | 
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  | FM: M = 06H  | RTTY (L): M = 08H  | 
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  | RTTY (U): M = 09H PKT (L): M = 0AH PKT (F): M = 0BH  | 
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  | Pacing  | –  | –  | –  | N  | 0EH | Add   | 
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  | downloaded data returned from the transceiver  | 
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  | PTT  | –  | –  | –  | T  | 0FH | Transmitter ON (T = 01H) or OFF (T = 00H)  | 
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  | Instructs the radio to return 1, 16, 32, or 1863 bytes of Sta-  | 
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  | tus Updata data. X is significant only when U = 1 ~ 4.  | 
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  | X = 00H ~ 71H: desired memory channel  | 
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  | Status  | X  | –  | –  | U  | 10H | (1 ~ 99, P1 ~ P9, or QMB 1 ~ QMB 5)  | 
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  | Update  | 
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  | U = 00H All 1863 byte  | 
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  | U = 01H   | 
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  | U = 02H   | 
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  | U = 03H 2 x   | 
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  | U = 04H 1 x   | 
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page 94  | 
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