GE HE500TIU110, IC300TIU201, IC300TIU101 manual Automation Equipment Port Receive Transmit LEDs

Switch 1

Switch 2

Switch 3

CH. 3: TIU100/101/102/103	06 Apr 2000	PAGE 21
		GFK-1819

	R x		R x
	Tx		Tx
Serial P ort		PC Port

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

Figure 3.3 – Automation Equipment Serial Port

3.5.1TIU10X 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

ON: Pull-up (must be used together with switch 3)

OFF: no Pull-up

ON: 120Ω termination

OFF: no termination

ON: Pull-down (must be used together with switch 1)

OFF: no Pull-down

Switch 4Reserved 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-upand Pull-downswitches 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.