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22 RS-232/RS-422/485 Option

Multi-drop Slave Mode

By placing a jumper on position A of jumper blocks JB4, JB5,

JB6, JB7 and on J1 (ports 1 & 2) or J2 (ports3 & 4) you can run

the individual RS-422/485 ports in multi-drop slave mode. In this

mode the TxD line driver is enabled only when data is transmitted

and RxD is enabled all the time. This mode is typically used in

multi-drop "4 wire" connections.

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, JB7 and J1,

J2 where RS-422/485 ports 1, 2 are set for multi-drop slave mode.

Ports 3, 4 are RS-232 and therefore should not be set for multi-drop

slave mode.

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

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 you should not jumper J1. If both

ports 3 and 4 are set for full duplex then you should not jumper J2.

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

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