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Xtreme/104 Opto User Manual

CTIM-00007 (0.10) 3/21/2012 www.connecttech.com 22

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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.

Figure 10: Half Duplex Mode Jumper Setting Example

In the following example, Ports 1 and 2 are set for half duplex mode. Ports 3 and 4 are

RS-232 and therefore should not be set for half duplex.

JB4

JB5

JB6

JB7

Jumper is

on 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

NOTE:

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.

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