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Chapter 4: Appendices – RS-485/422 Interface
Line Termination
You can use jumper blocks JC, JD, JE and JF to terminate and
bias TxD ±, RxD ±, RTS ±, and CTS ± on the individual RS-
485/422 ports through jumper selectable 150 Ω fixed resistors.
Please refer to Figure 4 for a partial schematic of the RS-485/422
circuit for the Titan/cPCI and to Figure 1 for the locations of JC,
JD, JE and JF.
Figure 4: RS-485/422 partial schematic
PCI 954
UART
Note: Line bias/termination is jumper selectable
Titan/cPCI
RS-485/422 Line Bias/Termination
TxD
150 Ω
DTR
JA0, JA1, JA2, JA3
JC3, JD3, JE3, JF3
RxD
JC4, JD4, JE4, JF4
RTS
150 Ω
JC1, JD1, JE1, JF1
CTS
JC2, JD2, JE2, JF2
JC5, JD5, JE5, JF5
10K Ω
+5 V
1.8K Ω
150 Ω
1.8K Ω
JC6, JD6, JE6, JF6
1.8K Ω
150 Ω
1.8K Ω
+5 V
Titan/cPCI User's Manual, ver. 0.00
4-11
TxD +
TxD -
RxD +
RxD -
RTS +
RTS -
CTS +
CTS -
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