A)
Power LED
B)
Data LEDs
C)
Fiber Optic ports
D)
Serial TB
E)
Ground Lug
F)
DIP Switch
G)
Serial Mode Switch
H)
Power TB
Product Overview
Configuration DIP Switch
Fiber Optic Connections
Power & Ground Connection
Wiring Examples
1
4
2
3
Terminal
RS-485 2-Wire
RD422/485 4-Wire
A
---
TDA (-)
B
---
TDB (+)
C
DATA A (-)
RDA (-)
D
DATA B (+)
RDB (+)
E
Ground
Ground
Built-in Termination Resistor
5
Use the 120Ω Built-in Termination
ON
Use External or No Termination
OFF
Built-in Trasmit Bias Resistor
6
Use the External or No Bias Resistor
ON
Use the 1.2KΩ Transmit Bias Resistor
OFF
Built-in Receive Bias Resistor
7
Use the External or No Bias Resistor
ON
Use the 1.2KΩ Receive Bias Resistor
OFF
Fiber Optic Mode
8
Multi-drop Ring
ON
Point-to-point
OFF
1
2
3
4
RS-485 2-Wire
Half Duplex
ON
ON
ON
ON
RS-485 4-Wire
Full Duplex
ON
OFF
OFF
OFF
RS-422 Full
Duplex
OFF
OFF
OFF
OFF
Terminal
Signal
Direction
A
RD
Output
B
---
---
C
TD
Input
D
---
---
E
Ground
---
For an explanation of RS-485 termination requirements,
more documentation can be found at advantech-bb.com
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2-Wire RS-485
RS-422/ 4-Wire RS-485
RS-232
Point-to-Point
Positions 5, 6, 7 are used for termination and biasing. Position 8 is
used for fiber optic point-to-point or multi-drop ring.
Position 1 = ON for RS-485, OFF for RS-422. Positions 5, 6, 7
are used for termination and biasing. Position 8 is used for fiber
optic point-to-point or multi-drop ring
DIP Switch positions 1 through
7 have no effect in RS-232
mode. Set position 8 to OFF
for fiber optic point-to-point or
multi-drop ring.
Set DIP Switch position 8 to OFF on both converters. Connect
Fiber Optic TD to Fiber Optic RD and vice versa.
E = Ground
Note: Your FOSTCDRi-PH-x converter can only connect to
another FOSTCDRi-PH-x converter model at the other end of
the fiber optic cable.
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