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Internal SW1 DIP Switch Functions
The internal SW1 DIP switches are used for application setup. All units are configured and tested at the
factory and two are typically pre-labeled according their position in the bus (#1 is the left-end unit in the bus;
#2 is the right-end unit).
Single-Master Units
SW1_1 & SW1_2 disable the "RxA" & "RxB"
optic receivers when switched to the Left position.
These two switches should be set according to the
position of the unit in the bus. Typically, "RxA" is
disabled on the first unit (Master or Slave) and
"RxB" is disabled on the last unit (End unit). All
other units (between the first and last units in the
bus) should have SW1_1 & SW1_2 in the Right
position for normal multi-drop operation.
The Master unit (TC2200) and Slave unit (TC2201) are interchangeable by sliding SW1_3 to the left or right.
NOTE 1: For customers who purchased the TC2200s before February 1, 2006, follow the SW1_3 settings
for interchanging the Master and Slave units as shown on the dialog box above.
NOTE 2: For customers who purchased the TC2200s after February 1, 2006, the SW1_3 settings for
interchanging the Master and Slave units are reversed than the settings shown on the dialog box above.
To set the unit as a Master, set SW1_3 to the Left "On" position. To set it as a Slave unit, set SW1-3 to the
Right "Off" position. The front panel's "MASTER" or "SLAVE" LED will light to indicate which
configuration the unit has. This is true for all types of electrical interfaces.
If the TC2200/2201 has an RS-422 or RS-485 (or RS-530) interface, then the unit's DTE or DCE
configuration can be changed by flipping SW1_4 (left for DTE; right for DCE). If the TC2200/2201 has an
RS-232 interface, then the unit's DTE or DCE configuration can ONLY be changed by replacing the unit's
interface module (from the factory). The front panel's "DTE" or "DCE" LED will light to indicate which
configuration the unit has.
The TC2200/2201 has a built-in Anti-Streaming function. Anti-Streaming can prevent a defective RTU from
blocking out an entire response channel; once activated, the electrical signal from the defective RTU is
blocked and the entire response channel is disconnected from the Slave unit. This feature can be disabled
by sliding SW1_5 to the Right position.
SW1_6 on the internal DIP switch is not used and should be kept in the Right (Off) position.
SW1_7 & SW1_8 control the RS-485 transition timer setup. For RS-232 and RS-422 interfaces, these
switches should be kept in the Right (Off) position. For a 2-wire or 4-wire RS-485 interface, the electrical
signal bus will automatically transition to high impedance after transmitting. These two switches establish
the duration period(after the last bit is transmitted) before the RS-485 driver transitions to the high-impedance
receiver mode. The transition timer should be set according to the following table (Default = both Off):
Baud
SW1_8
On
9600
Off
19.2K
On
38.4K & up
Figure 8. RS-485 Transition Timer Setup Table
SW1_7
SW1_6
Off
Not Used
On
Not Used
On
Not Used
- 6 -
TC2200R/S Bus
User's Manual
Rev. 2.2
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