
PR821-CH User Manual.doc
2018-04-05
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3.
I
NSTALLATION
3.1 Terminals and connection diagram
Fig. 1 PR821-CH controller
Table 2. PR821-CH terminals
Terminal
Description
+ 12V
12VDC power supply
- 12 V
Ground
IN1
IN1 input line
IN2
IN2 input line
IN3
IN3 input line
RS485 A
RS485 communication bus
RS485 B
RS485 communication bus
CLK
RACS CLK/DTA bus
DTA
RACS CLK/DTA bus
TMP
Tamper switch
TMP
Tamper switch
IO1
IO1 output line
IO2
IO2 output line
REL1-NC
REL1 relay output (NC)
REL1-COM
REL1 relay common terminal
REL1-NO
REL1 relay output (NO)