Connect Tech Titan/cPCI - Manual (Page 30)

Titan/cPCI User’s Manual, Connect Tech Inc.
26 Revision 1.01
Full Duplex Mode (4 wire)
Ensure J1 and J2 for the specific port is removed. You must also ensure that the configuration
software does NOT have the ½ duplex or multi-drop slave mode enabled.
Half Duplex RS-422/485 (2 wire)
Ensure J1 for the specific port is removed, and that J2 for the specific port is installed.
Use the configuration software to enable the ½ duplex mode.
Multi-drop Slave Mode (4 wire)
Ensure J1 and J2 for the specific port is removed. Use the configuration software to enable the ½
duplex or Multi-drop slave mode.
Example
The example below shows the settings where RS-422/485 ports
1 and 2 are set for full duplex or multi-drop slave mode, port 3
is set for half duplex and port 4 is set for RS-232.
JA
Jumper Legend
1 = RS-232/RS-422/485
select
2 = RS-422/485 half
duplex mode control
3 = RTS +/- termination
4 = TxD +/- termination
5 = CTS +/- termination
6 = CTS +/- termination
7 = RxD +/- termination
8 = RxD +/- termination
1
2
3
4
5
6
7
8
JB
1
2
3
4
5
6
7
8
JC
1
2
3
4
5
6
7
8
JD
1
2
3
4
5
6
7
8
Port 1 Port 2 Port 3 Port 4
Technical Note:
Full duplex, multi-drop slave and half duplex modes apply to
RS-422/485 ports only. Please ensure that the port is set for
RS-422/485.
Line Termination
You can use jumper blocks JA, JB, JC and JD to terminate and bias RxD ± and CTS ± on the
individual RS-422/485 ports through a jumper selectable resistor network.
You can terminate TxD ± and RTS ± with a jumper selectable 150
Ω resistor.
Please refer to
Figure 8 for a partial schematic of the RS-422/485 circuit for the Titan/cPCI Rear
I/O Opto adapter and to Figure 5 for the locations of JA, JB, JC and JD.
Note:
Line termination and bias must be removed for RS-232 operation.