Mercury Security © 2014
EP1501
DOC 10107-0036
REV 1.07
Page 4
7. Reader/Serial I/O Device Wiring:
Reader port 1 supports TTL (D1/D0, Clock/Data), F/2F, or 2-wire RS-485 device(s). Reader port 2
supports TTL (D1/D0, Clock/Data), or F/2F. Power to reader port 1 is 12 Vdc at 180 mA maximum. The
reader connected to reader port 2 may be powered from the 12 Vdc auxiliary power supply output; TB4-1
and TB4-2. Readers that require different voltage or have high current requirements should be powered
separately. Refer to the reader manufacture specifications for cabling requirements. In the 2-wire LED
mode, the buzzer output is used to drive the second LED. Reader port configuration is set via the host
software.
Reader port 1 can support up to eight 2-wire RS-485 remote serial I/O devices using MSP1 protocol or up
to two OSDP devices. If two OSDP devices are used, reader port 2 will not support a third reader. If only
one OSDP device is configured, then reader port 2 is available for a second reader. The maximum cable
length is 2000 ft. (610 m). Do not terminate any RS-485 devices connected to reader port 1.
When powering remote device(s) from the EP1501, be cautious not to exceed the maximum current limit.
Cable gauge must also be evaluated. See specifications section for details.
Reader Wiring Diagrams:
Reader Port 1
Typical D1/D0 or Clock/Data Reader
Reader Port 2
Typical D1/D0 or Clock/Data Reader
Reader Port 1
Typical Unsupervised F/2F Reader
Reader Port 2
Typical Unsupervised F/2F Reader
1
TB2
VO (12 Vdc)
GND
LED
BZR
CLK/D1
DAT/D0
FIRST READER PORT
TB3
1
BZR
DAT/D0
CLK/D1
LED
SECOND READER PORT
1
TB4
GND
VIN
GND
VO
(12 Vdc)
+12 Vdc
D1
GROUND
DO (GREEN LED)
F/2F Reader
1
VO (12 Vdc)
GND
LED
BZR
CLK/D1
DAT/D0
TB2
FIRST READER PORT
TB3
1
BZR
DAT/D0
CLK/D1
LED
1
TB4
GND
VIN
GND
VO
+12 Vdc
D1
GROUND
DO (GREEN LED)
F/2F Reader
SECOND READER PORT
