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20 RS-232/RS-422/485 Option

Technical Tip:

You can set up the RS-232 serial ports to run at up to 230.4 Kbps, but

you must use good quality serial cables with lengths that do not exceed 2

metres.

Full Duplex Mode

By making sure that there are no jumpers on positions A and C of

jumper blocks JB4, JB5, JB6 and JB7 you can run the individual

RS-422/485 ports in full duplex mode. In this mode, TxD & RxD

are active all the time. This mode is typically used in point to

point situations much like RS-232.

Figures 1 and 2 show the locations of jumper block JB4, JB5,

JB6, JB7 and J1, J2.

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.

Xtreme/104 Opto User's Manual, ver. 0.03

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