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CH. 3: TIU100/101/102/103 06 Apr 2000 PAGE 21
GFK-1819
3.5.1 TIU10X Configuration of the RS-485 Port
The configuration bank (shown in Figure 3.8) sets the parameters of the RS-485 port as described in
Table 3.1.
Table 3.1 – Configuration Bank
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.
Figure 3.4 – Automation
Equipment Port Receive &
Transmit LEDs
The LED’s flash when the TIU10X
is communicating with the AE.
Figure 3.5 – PC Port Receive &
Transmit LEDs
The LED’s flash when the PC is
communicating with the TIU10X
Serial Port
Tx
Rx
PC Port
Tx
Rx
Figure 3.3 – Automation Equipment Serial Port