Connect Tech JB2 - Manual (Page 31)

Chapter 4: Appendices – RS-485/422 Interface 4-11
Titan/cPCI User’s Manual, ver. 0.00
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
TxD
TxD +
RxD -
TxD -
RxD +
Titan/cPCI
RS-485/422 Line Bias/Termination
RxD
RTS
RTS +
CTS -
RTS -
CTS +
CTS
PCI 954
UART
150 Ω
1.8K Ω
1.8K Ω
+5 V
150 Ω
1.8K Ω
1.8K Ω
+5 V
150 Ω JC5, JD5, JE5, JF5
150 Ω JC6, JD6, JE6, JF6
JC3, JD3, JE3, JF3
JC4, JD4, JE4, JF4
JC1, JD1, JE1, JF1
JC2, JD2, JE2, JF2
10K Ω
DTR JA0, JA1, JA2, JA3
Note: Line bias/termination is jumper selectable