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RS-232/RS-485/422 Option 23

Xtreme/104 User's Manual, ver. 0.01

Line Termination

Jumper blocks JB4, JB5, JB6 and JB7 can terminate the

transmitters and receivers on the individual RS-485/422 ports

through jumper selectable 120 Ω fixed resistors.

Please refer to Figure 1 for the locations of JB4, JB5, JB6, JB7

and J1, J2.

Example

The following example shows the settings on JB4, JB5, JB6

and JB7 where the half duplex RS-485 port 1is terminated, the

full duplex RS-485 port 2 is terminated, the multi-drop slave

RS-485 port 3 is not terminated, and the RS-232 port 4 is not

and should not be terminated

JB4

JB5

JB6

JB7

Technical Notes:

1. For half duplex RS-485 ports you only jumper positions D

and E on the appropriate jumper block (JB4, JB5, JB6 or

JB7) if you want them terminated.

2. For full duplex and multi-drop slave you can jumper

positions D, E, F, and G on the appropriate jumper block

(JB4, JB5, JB6 or JB7) if you want them terminated.

3. For RS-232 ports do not jumper positions D, E, F and G

on the appropriate jumper block (JB4, JB5, JB6 or JB7).

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