Epsilon-8100 User Manual Revision A.3
www.diamondsystems.com
Page 11
5.4 LED Status Signals (J13)
Connector J13 provides access to the Ethernet LED signals for each of the eight ports. This connector has
duplicate connections for Reset control input. LEDs may be directly connected to these signals without requiring
any current-limiting resistors.
The on board activity LED is a green LED (LTST-C190GKT) with a typical forward voltage of 2.1V and a
maximum of 2.6V with a 20mA If. The on board speed LED is a Yellow LED (LTST-C190YKT) with the same
characteristics. The control signal is capable of sinking a maximum of 18mA. The series resistor is 330 ohms,
which gives an If of about 3.6mA. When an LED is connected to connector J13, it is in parallel with the on board
LED. If the external LED has about the same forward voltage, the current will be cut in half. If the external LED
has a lower forward voltage, it will dominate the on-board LED and be brighter. Therefore, if the external LED is
not bright enough use an external LED with a lower forward voltage.
Reset: Causes a reset of the switch when connected to ground.
SW_GPIO1 and SW_GPIO2 - provide control for user defined LEDs.
3.3V
29
30
3.3V
SW_GPIO1
27
28
SW_GPIO0
Default-
25
26
Reset-
Port 1 Speed
23
24
Port 1 Activity
Ground
21
22
Port 3 Activity
Port 3 Speed
19
20
Ground
Port 5 Speed
17
18
Port 5 Activity
Ground
15
16
Ground
Port 7 Speed
13
14
Port 7 Activity
Port 8 Activity
11
12
Port 8 Speed
Ground
9
10
Port 6 Speed
Port 6 Activity
7
8
Ground
Port 4 Activity
5
6
Port 4 Speed
Ground
3
4
Port 2 Speed
Port 2 Activity
1
2
Ground
Connector Type:
2mm dual row right-angle, locking pin header with tin plating
Mating Connector:
JST Sales America PUDP-30V-S housing with SPUD-002T-P0.5 terminals
The following diagram shows how to connect external LEDs to connector J13: