CSE-H21 User’s Manual Ver. 1.2
Sollae Systems Co., Ltd.
- 8 -
http://www.sollae.co.kr
1.4.2
LED indicators
There are 15 LED indicators on the CSE-H21. The left 5 are for LAN status, and the middle and
right 5 are for COM1 and COM2 respectively. The followings are the operations of each LED
indicators.
Table 1-1 LED indicators
Name
Color
LED Status
Description
PWR
Red
On
Power is on.
L
A
N
STS
Yellow
Blink every 1
second
IP address is assigned.
Blink 4 times
every 1 second
IP address is net assigned in DHCP or PPPoE
modes.
Off
ISP Mode
LINK
Green
On
CSE-H21 is connected to the Ethernet.
RXD
Yellow
Blink
Ethernet packet is received
TXD
Green
Blink
Ethernet packet is transmitted
C
O
M
TCP
Green
On
TCP is connected
RXD
Yellow
Blink
serial data are received
TXD
Green
Blink
serial data are transmitted
RTS
Green
On
There are enough rooms to receive serial
data.
CTS
Yellow
On
CTS signal from the counter-part serial
device
1.4.3
ISP Switch
There is an ISP switch on the side. If this switch is push 20ms~1s, it operates as Serial
Configuration Mode. If this switch is push over 1 second, CSE-H21 operates as ISP mode. User can
do firmware download to the CSE-H21 in the ISP mode. Please refer to 4.2 for more information
on firmware download.