Comtrol DeviceMaster Up Hardware Installation Manual page 26

Connecting Devices
26 - DeviceMaster UP User Guide: 2000451 Rev. C
The DeviceMaster UP 4-port model has Rx and Tx LEDs next to each port that
provide information about the network connection of the serial port.
LED
LED on the front panel of the DeviceMaster UP is lit, indicating you
have power and it has completed the boot cycle.
PWR
Note: The PWR LED flashes while booting and it takes approximately
15 seconds for the bootloader to complete the cycle.
The red LNK ACT LED is lit, indicating
LNK
that you have a working Ethernet
ACT
connection.
If the red COL LED is lit, there is a
COL
network collision.
If the red 100 LED is lit, it indicates a
working 100 MB Ethernet connection (100
100
MB network, only).
• The amber Rx LEDs shows that the port is
connected to another RS-232 device or
receiving data in RS-422/485 mode.
• The green Tx LED shows that the data is
transmitting.
Description
10/100 NETWORK
UP
DB9 LEDs
* Represents port number.
Connecting Serial Devices
LNK
ACT
COL
100
DOWN
RX1*
*
TX1