RM-4E Components
11
NOTE
When the wiring gauge is too small or the wiring runs are too long, the
Yellow LED drive oscillation can cause cross-talk and result in misreads.
RS 485 Reader Bus
RS 485 is the reader bus connection to the apC or iSTAR.
It is two wire, half duplex RS 485.
Connect Tx+ / Rx+ to Pin 2 and connect Tx- / Rx- to Pin 3.
The pins are numbered right to left on the connector.
Connecting Read
Heads
Connect read heads to the Read Head connector.
Connect either a Wiegand signaling device or a magnetic (ABA)
signaling device. Wiegand signaling uses Data 1 and Data 0 lines and
magnetic signaling uses Clock and Data.
Wiegand Signaling
For Wiegand signaling, use the following pinout; set SW5-1 to ON.
TABLE 4.
RS 485 Reader Bus Connections
Pin
Signal
Function
4
Gnd
Ground
3
D-
Tx- / Rx- (usually green)
2
D+
Tx+ / Rx+ (usually white)
1
+12
+12 VDC (if required)
TABLE 5.
Wiegand Signaling Pinout
Pin
Signal
Function
1
D1
Data 1 line (white)
2
D0
Data 0 line (green)
3
N/C
No connection
4
+5 VDC
+5 VDC if required
5
GND
Ground
6
+12 VDC
+12 VDC if required
