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DIP Switch Functions
LED Functions
DIP Switch Functions
SW1 - Left: Normal Operation
SW2 - Internally loopback optic signal
SW3 - Generate 1Hz blink TD signal to verify optic connectivity
SW4 - Only used for advanced diagnose, see related section
SW5 - Not used
Figure 3.
TC1540's DIP Switch Functions
Power Indicator:
On -
Unit's power supply is adequate
Off -
Power is not reaching the unit
Optic Sync Indicators:
Flashing -
Optic signal lost or below sensitivity level.
On -
Optic signal is valid.
Transmit Data Indicator:
(actual logic status on
O f f :
Logic "1" or "Mark" (this is idle state)
RS422 - Voltage on "+" terminal > "-" terminal's voltage.
RS232 - Negative input voltage.
O n :
Logic "0" or "Space",
RS422 - Voltage on "+" terminal < "-" terminal's voltage.
RS232 - Positive input voltage.
Receive Data Indicator:
(actual logic status on output terminal block depend on electrical interface),
same logic state as input terminal blocks.
Collision Indicator:
Refer to Chapter 3 - Troubleshooting Section for detail.
Reverse Polarity:
On -
The input RS422/RS485 signal's polarities are reversed.
Driver Mode:
On -
When in RS-485 mode, the output terminals are
in driver mode
Off
- the output termnal terminals are in receive mode.
RS485/RS422 Mode:
On -
RS-485 mode.
Off
- RS-422 mode.
Figure 4.
TC1540's LED Indicator Functions
Right: Electrical Local Loopback (for diagnostics)
for detail. It should be kept at left position for normal
operation.
SW6, SW7, SW8 - Set the RS-485 transition timer (see Table 1)
Input
Terminal Block pins depend on electrical interface)
- 5 -
TC1540D User's Manual
Rev. 1.2
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