Line termination, Figure 7: rs-422/485 partial schematic – Connect Tech Titan/cPCI User Manual
Page 26
Titan/cPCI User’s Manual, Connect Tech Inc.
Revision 1.01
21
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-422/485 ports through jumper selectable 150
Ω fixed resistors.
Please refer to
for a partial schematic of the RS-422/485 circuit for the Titan/cPCI and
to
for the locations of JC, JD, JE and JF.
TxD
TxD +
RxD -
TxD -
RxD +
Titan/cPCI
RS-422/485 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
Figure 7: RS-422/485 Partial Schematic
Note: Line bias/termination is jumper selectable