What to do if Johnson Controls CK721-A controller has a hardware failure?
If the CK721-A controller has a hardware failure, return the defective controller to Johnson Controls by initiating a Return Material Authorization (RMA). Contact your Johnson Controls Representative or enter an RMA at this Employee Portal site: http://spcweb.cg.na.jci.com/rma
How to fix Johnson Controls CK721-A Controller firmware installation failure?
If the firmware installation fails on your Johnson Controls CK721-A controller, check the pin connections if you constructed the cables yourself. Also, verify that the settings on your computer are correct and disable any conflicting software to successfully upgrade the controller firmware. See Figure 1: Connections between Computer and CK721-A Controller for reference.
General| Input Type | Analog, Digital |
|---|---|
| Output Type | Analog, Digital |
| Communication Protocol | BACnet MS/TP |
| Operating Temperature | -20°C to 60°C |
| Weight | 0.44 lb (0.2 kg) |
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