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RS-232/RS-485/422 Option 21

Xtreme/104 User's Manual, ver. 0.01

Half Duplex RS-485

By jumpering positions A and C of jumper blocks JB4, JB5, JB6

and JB7 you can run the individual RS-485/422 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

Figure 1 shows 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-485 ports 1, 2 are set for half duplex mode.

Ports 3, 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

Technical 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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Connect Tech JB2 Manual de usuario Pagina 27