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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| F1 | F2 | F3 | F4 | 0AH |
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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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