Missingtrouble

Silent Knight 5820XL: Missing

Silent Knight 5820XL·1 view·0 field notes

What This Code Means

SLC devices are not being recognized by the control panel, indicating a communication failure with a programmed device.

Common Causes

1Incorrect hardware connections or wiring polarity
2SLC devices addressed improperly
3Devices connected to SLC IN terminals instead of SLC OUT
4SLC loop impedance is outside the required range

Resolution Steps

Check hardware connections. If devices are physically connected, make sure wiring is correct. For the main panel, the positive side of device must be connected to terminal 34; the negative side must be connected to Terminal 33. For 5815XL devices, make sure the device connects to the 5815XL via the SLC OUT terminals. Do not connect devices to terminals labeled SLC IN. Make sure SLC devices have been addressed properly. Check that SLC loop impedance is within the required range.

Manual References(4)

1silent knight5820XLInstallation2007Open

2silent knight5820XL & 5820XL-EVSInstallation2017p. 199, 191, 200Open

3silent knight5820XLDatasheet2006Open

Field Notes

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Related Codes

SLC Class A supervision lostThe panel has lost the return path for a Class A SLC loop configuration.Short circuit detected on SLC communication loopA short circuit has been detected on the Signaling Line Circuit wiring.DBL ADDRAn address has been assigned to more than one detector on the SLC loop.Printer offlineThe system printer is not communicating with the control panel.SUPERVISORYThe system detects a supervisory condition, which indicates that a monitored device like a tamper switch or duct detector is in an off-normal state.