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RS-422 & RS-485 Termination Resistors
A termination resistor is usually necessary for RS-422 and RS-485 applications. Without proper termina-
tion, the error rate of data transmission may be high due to an "echo" effect on the electrical connection.
With the addition of a termination resistor at the beginning or end of the electrical bus, this echo effect is
greatly reduced. The termination resistors are 100 to 130 ohm resistors located inside the TC2200/2201.
Two jumpers, located on the Interface Module at board locations "W1" & "W5," control the termination
resistance on each unit (factory default = installed). "W5" controls the resistance for the unit's receiver,
while "W1" controls the transmitter's resistance. Proper line termination is usually accomplished by
leaving the "W5" jumper installed at both ends of the link. There is no termination resistor required for RS-
232 applications.
Terminates pins 2 & 14
Fiber Optic Specifications
Transmission Distances (typical)
The TC2200 and TC2201 are compatible with all popular sizes and types of fiber. Transmission distances
up to 3km* are typical over Multimode fiber at 850nm and 4km* at 1310nm. Distances to 30km* are typical
over Single Mode fiber at 1310nm.
Launch Power & Sensitivity
Transmitter:
LED/ELED; typical Launch Power -
Receiver:
PIN Diode; typical Sensitivity -
*Launch power, sensitivity & distance are listed for reference only. These numbers may vary.
W1: (Installed)
TB3
INTERFACE SIMM MODULE
on
8
7
6
TC2200R/S
5
4
3
2
1
SW1
TC2201R/S
TxB
RxA
Figure 13. Termination Resistor Locations
W5: (Installed)
Terminates pins 3 & 16
Female DB25
or
SW2
1 2 3
4
TxA
-20dBm* (850nm/1310nm MM, @62.5/125µm)
-16dBm* (1310nm Single Mode, @9/125µm)
-36dBm* (850nm/1310nm MM, @62.5/125µm)
-36dBm* (1310nm Single Mode, @9/125µm)
- 10 -
TB2
TB1
RxB
TC2200R/S Bus
User's Manual
Rev. 2.2
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