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DIP Switch Functions
For troubleshooting purpose, user can conduct remote loopback and local loopback test. TC1710 also has
a built-in signal generator for user to validate fiber optic link. There are two groups of DIP switches: one
at the front panel, the other one is located at the center of the PC board.
Front Panel Switches
There are four DIP switches located at the front panel. Usually, they are very
useful during installation or troubleshooting. They are described as follows:
(Note: Remote loop back, Local loop back, and Internal clock generator tests, are only
used for RS-232 and RS-422/RS485 four wire, electrical interfaces.)
DIP #1:
Remote loop back. This switch (DIP #1) initiates the Remote loop
back function. The composite optic signal is received from optic "RxA"
and decoded, then looped back to optic "TxA."
DIP #2:
Local loop back (for diagnostic use). When DIP #2 is pressed down, an electrical signal loop
is created, the input electrical signal is converted to the TTL level and looped back.
DIP #3:
Internal clock generator "off" when DIP #3 is in the up(off) position. When switched to the down
("on") position, the received clock signal (from the remote side) is also used as an internal clock
signal and is transmitted to the user's equipment.
DIP #4:
Disable dry contact alarm.
These functions can be initiated from one of four DIP switches accessible from front panel. Under normal
operation, all the switches should be set in "UP" position.
SW1 Internal PCB Switches for RS-485 Transition Timer Setup
There are other eight DIP switches located at the PC board and can not be accessed from front panel. These
switches are usually only used during installation.
SW1-1:
Enable signal generators. This switch initiates the built-in Signal Generator function. The unit
will generate a visual signal to verify optic link.
SW1-2:
Configure TC1710's interface as a DTE/DCE. Not Used, set to Off position.
SW1-3:
Enable RxB.
SW1-4:
Sync/Async. For RS-485, it must be set to Async (On) position.
Note: When DIP Switches SW1-5 through SW1-8 are Off, the unit is set for RS-422. Otherwise, the unit
is set for an RS-485 application, and a baud rate can be selected according to the following table.
SW1-5:
SW1-6:
SW1-7:
SW1-8:
Table 1.
Settings for the RS-485 Transition Timer (Internal SW1)
−6−
TC1710 RS-485
(Optional Dual Optics)
User's Manual
Rev. 1.6
1
2
3
4
Internal SW1
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