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LOGIC CONNECTION SPECIFICATIONS
The logic capability of the UC4 receiver provides two functions: transmitter status indication (which can be used to signal and control other events) and transmitter low battery indication. The various logic functions and their applica- tions are presented in the following table. Refer to Figure 28 below for pin mapping.
Pin No. | Function | Transmitter Status | Logic Level | Typical Applications | Connections |
1 | Signals or controls | On | Low (0V) | •Drives a remote LED. | Tie the transmitter status |
| other events. | Off | High (+5 V) | •Provides remote indica- | pin to podium mic mute in- |
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| put terminal on the automat- | |||
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| 100 mA of | tion of transmitter status | |
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| ic mixer | ||
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| current | when used with a Room | Tie receiver logic ground to |
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| sinking | Control System (i.e., | |
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| mixer logic ground. | ||
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| provided. | Crestron or AMX) | |
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| •Activates external equip- |
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| ment (equalizer, signal |
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| processor, loudspeakers, |
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| etc.) when used with a |
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| Room Control System. |
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| •Transmitter status control |
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| muting/unmuting of an in- |
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| put channel on automatic |
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| mixer. Used with auto- |
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| matic mixers, such as |
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| Shure Model SCM810 |
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2 | Logic Ground* | ±± | ±± | ±± | Make all logic ground con- |
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| nections to this pin, includ- |
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| ing the power supply |
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| ground of external logic cir- |
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| cuitry. To avoid switching |
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| noise, do not connect logic |
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| ground to audio, chassis, or |
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| rack grounds. |
3 | Remote indication of | Good Battery (1±8 hours of | Low (0 V) | •Drives a remote LED to |
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| transmitter battery | battery life remaining) |
| light when battery is low. |
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| status. | Low Battery (1 hour of less | High (+5 V) | •Indicates low transmitter |
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| of battery life remaining) |
| battery status on remote |
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| control panel when used |
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| with a Room Control |
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| System. |
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*Logic ground is distinct from UC4 audio ground.
SCM810 MIXER DB 25 LOGIC CONNECTOR
GATE 1 |
| GATE 3 |
| GATE 5 |
| GATE 7 |
| LOGIC | |||||
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| MUTE 1 |
| MUTE 3 |
| MUTE 5 |
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| GROUND | ||||
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| MUTE 7 | ||||||||
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| OVERRIDE 2 |
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| OVERRIDE 4 |
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| OVERRIDE 6 |
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| OVERRIDE 8 |
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| MUTE 2 | MUTE 4 | MUTE 6 | MUTE 8 |
| GATE 2 | GATE 4 | GATE 6 | GATE 8 |
OVERRIDE 1 | OVERRIDE 3 | OVERRIDE 5 | OVERRIDE 7 |
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UC4 LOGIC CONNECTOR
LOGIC GROUND
PIN 1: TRANSMITTER STATUS OUT
PIN 2: LOGIC GROUND
PIN 3: TRANSMITTER LOW BATTERY
TYPICAL UC4 CONNECTIONS TO SCM810 MIXER LOGIC CONNECTOR
FIGURE 28
NOTE: For more information on logic functions, please contact the Shure Applications Department.
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