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SIMATIC 545/555/575 System Manual

Installing 575 System Hardware

Port 3 is an RS-422 port. This is the alternate programming port. You can

connect it to a programming device that has an RS-422 interface, or you can

use an RS-422-to-RS-232 converter and connect it to an RS-232

programming device. This port allows the programming device to be

separated from the 575 by 100 meters. For proper operation over long

distances, the CPU transmitter should be terminated with 120 Ω, 1/8 W, 5%

tolerance, low-inductance resistors at both the receiving end and the

transmitting end. The CPU receiver is terminated with an internal 120 Ω

resistor. The programming device’s transmitter should be terminated at the

programming device. Connect the programming device’s transmitter to pins

9 and 10. Connect the programming device’s receiver to pins 12 and 13.

Refer to Figure 4-30 for a connection example. You can change the baud rate

of this port by using your SoftShop or TISOFT programming software.

GND

TX+

RX+

Programming

Device with

RS-422

Interface

RX–

TD*

TX–RD*

*Optional—see text

25-Pin, Male

D Connector

Port 3 (RS-422)

120 Ω∗ 120 Ω∗

120 Ω∗

Figure 4-30 Cable to Connect Port 3 to an RS-422 Programming Device

Port 4 is reserved for factory use.

Serial Port 3

Serial Port 4

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 321 322

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Siemens SIMATIC TI500 Especificaciones Pagina 132