Johnson Controls Mercury 3 Series Hardware Installation page 9

CKM-MR52-S3
24-10707-198 Rev. –
To fully utilize each reader port:
• TTL signaling requires a 6-conductor cable (18 AWG)
• RS-485 signaling requires two 2-conductor cables. Use one cable for
power (18 AWG) and one cable for communication (24 AWG, with
drain wire and shield).
N : If the input voltage to the MR52 is 12 VDC, jumper J1 must be in the PT
OTE
position.
Figure 4: J1 - Reader Port Power Select
Figure 5: Typical D1/D0 - Clock/Data Reader
Figure 6: Typical 2-Wire RS-485 Device
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Hardware Installation Manual