Honeywell DCP552 Mark II - Manual (Page 41)

4 - 11 Communication Connection
■ RS-485 connection
Handling Precautions
• The slave station can be connected in a multi-drop configuration.
• Always set a unique address to each slave station.
• Attach terminating resistances (a total of four when connecting a 5-wire
system) to the ends of the communications lines. Use 1/2W or greater
terminating resistances of 150Ω ±5%.
• If connecting three lines, short-circuit terminals (60), (62) and (61), (63).
• Do not short-circuit the RDA to RDB and SDA to SDB terminals.
Doing so may cause the DCP552 to malfunction.
4-13
60
SDB
61 62 63 64
RDA RDB SG SDA
Chapter 4. WIRING