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Xtreme/104 Opto User’s Manual, Connect Tech Inc.

19 Revision 0.05

Full Duplex Mode

If you wish to run the individual RS-422/485 ports in full duplex mode, do not install jumpers

across positions A and C of jumper blocks JB4, JB5, JB6 and JB7. In this mode, transmit and

receive are active all the time. This mode is typically used in point-to-point situations much like

RS-232.

See Figure 1 and Figure 2 for the locations of jumper blocks on your model.

Figure 7: Full duplex mode jumper setting example

Example

The example below shows the settings on JB4, JB5, JB6, and J1, J2

where RS-422/485 ports 1, 2 and 3 are set for full duplex mode. Port

4 is RS-232 and therefore is not set for full duplex.

JB4 JB5

JB6

JB7

Jumper is

off J1

Jumper is

off J2

Note: Rev A & B Xtreme/104 Opto adapters do not have

positions H & I on jumper blocks, JB4, JB5, JB6, and JB7

Jumper Legend

(Rev. C & later adapters)

A = TxD control

B = RS-232/RS-422/485

select

C = RxD control

D = RTS terminator

E = TxD terminator

F = RxD terminator & bias

G = RxD terminator & bias

H = CTS terminator & bias

I = CTS terminator & bias

Jumper Legend

(Rev. A & B adapters)

A = TxD control

B = RS-232/RS-422/485

select

C = RxD control

D = RTS terminator

E = TxD terminator

F = CTS terminator

G = RxD terminator

Technical Tip:

J1 controls ports 1 and 2 and J2 controls ports 3 and 4. If both ports

1 and 2 are set for full duplex then J1 should not be jumpered. If both

ports 3 and 4 are set for full duplex then J2 should not be jumpered.

Half Duplex RS-422/485

Place jumpers on positions A and C of jumper blocks JB4, JB5, JB6 and JB7 to run the

individual RS-422/485 ports in half duplex mode. In this mode your Xtreme/104 Opto adapter

controls the transmitter and receiver circuits. RTS is turned on prior to and during transmission

to cause the transmit driver to enable and the receiver to disable. RTS is turned off when not

transmitting to cause the transmit driver to disable (tri-stated) and the receiver to enable. The

Xtreme/104 Opto adapter is responsible for timing the RTS toggle.

See Figure 1 and Figure 2 for jumper block locations.

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