Setting up the Reader
8
Table 3 on page 8 indicates the wiring for units with keypads.
Grounding and Shielding
Single RM Reader
To wire a single RM reader to a RS-485 controller port:
1. When connecting a single RM reader to the reader bus, use twisted pair,
shielded minimum 24 AWG cable. Attach the shield at the controller end.
(Refer to TAB 2010-15 “RM Reader ESD Protection Guidelines.”)
2. Attach a local earth ground (18 or 22 gauge) wire to the J5 component on
the reader.
Multiple RM Bus devices
To update multiple RM Bus devices on a single RS-485 port:
1. Attach the shields along the bus together (insulate each connection). Snip
off the shield wire at the end of the bus. See Figure 5 on page 9.
2. Attach the shield to the ground at only one point – at the ground stud inside
the controller
3. Attach a local earth ground (18 or 22 gauge) wire to the J5 component on
the RM reader.
Table 3: Wiring for Units with Keypads
J2 Pin Function
1 Col 3
2 Col 2
3 Col 1
4 Col 0
5 Row 3
6 Row 2
7 Row 1
8 Row 0
1
23
4
5
6
7
89
0
CE
CMD
ENT
C3
C2
C1
R3
R2
R1
R0
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