Service Manual Chapter3. User Handling Unit
© 2016
Nautilus Hyosung Inc.
All Rights Reserved.
3-7
Encryption PIN Pad
► EPP(Encrypted PIN Pad) is a device that encrypts sensitive data such as customers’
card information and passwords, which requires the highest level of security, and
transmits it to the Host. Therefore, if EPP problem occurs in the field, verify the
problem and replace the entire unit. You cannot disassemble the internal components
or replace them individually.
The following figure is the back of the EPP. The functions and roles of each part are
summarized as below.
No
Label
Setting
Description
Remarks
1
LED1
Green
Power LED
Common for
USB/Serial
2
LED2
Red
Flickering at one-second
intervals during normal
operation of EP
Common for
USB/Serial
3
LED3
Red
Serial Reception RX
Common for
USB/Serial
4
LED4
Green
Serial Transmission TX
Common for
USB/Serial
5
LED5
Red
NVRAM CLEAR
Common for
USB/Serial
6
SW3
No. 1
OFF
NVRAM CLEAR during No. 1 is
ON
Common for
USB/Serial
No. 2
OFF
If turning ON the No. 2 in the
status of J1 CLOSE, make the
FUSE OFF so that firmware
download can
’t be available
after this.
Common for
USB/Serial
7
J1
OPEN
Boot firmware download is
available for CLOSE.
Common for
USB/Serial
8
CN2
-
Power Connector
USB EPP
9
CN3
-
Serial Connector
USB EPP
10
J5
-
USB Connector
USB EPP
11
CN1
-
Power Connector
Serial EPP
12
CN2
-
Serial Connector
Serial EPP
