GE HE500TIU050 Manual De Usuario

5.5.1 

The configuration bank (shown in Figure 2.23) sets the parameters of the RS-485 port as described in
Table 5.1.

Switch 1

ON: Pull-up (must be used together with switch 3)
OFF: no Pull-up

Switch 2

ON: 120

Ω

 termination

OFF: no termination

Switch 3

ON: Pull-down (must be used together with switch 1)
OFF: no Pull-down

Switch 4

Reserved for future use

NOTE: Switch 1 and 3 must be used together.  Either both pull-up and pull-down are
used or neither is used.

Pull-up and Pull-down switches are used to increase the signal level on the RS-485 bus.  This is useful if
there is a long bus and a significant amount of attenuation is anticipated.

Termination resistance of 120

Ω

 must be placed across each end of the RS-485 bus.  With switch 2 ON,

a 120

Ω

 resistance is placed across the bus. This should only be used if the TIU050/10X/11X/20X is the

last device at either end of the bus.

72/(5$1&(6 $5(  µ >PP@ 81/(66 67$7(' 27+(5:,6(

7,8; &87287 '(7$,/6

µ

>

PP@

+0.02
-0.00

+0.5

-0.0

µ > PP@

83 72 µ &RUQHU >5$',86 ,6 $&&(37$%/(PP@

+0.02

-0.00