ABB PFEA111-20 3BSE050090R20 Tension controller

There are two main classes of Serial communication defined in the RS232 standard. • DTE (Data Terminal Equipment), such as terminals and computers. • DCE (Data Communications Equipment), such as modems. If standard D-type connectors are used, the convention is to mount female connectors on the DCE devices and male connectors on the DTE devices. Cables between DCE and DTE devices can be connected 1:1. Cables between devices of the same class require cross-over or ‘Null modem’ cables. Note that the signal names are from the viewpoint of the DTE. E.g. Transmit Data is sent by the DTE, but received by DCE. The CI is configured as a DTE class device. Table 19 below shows the signal directions for the common RS232 circuits.

Signal Directions for RS232 Circuits

 Table 20 below shows some alternatives for the wiring of port 1 when using a cable. Note that a male connector is specified on the cable for connection to the female connector of a DCE device and a female connector is specified for connection to the male connector of a DTE device. Note that the labels in the FROM section are shown the same as those on Product Descriptions PD-T8151B and PD-T8153. Please refer to these product descriptions for further information on cable wiring. Cable TC–305–01 (or –02) connects to the CI module field socket PL5 and extends the ports below to flying leads. Please refer to Product Description PD-TC300 for further details.

Maximum Cable Length 

The RS232 standard states that the maximum capacitive load seen by the driver should be 2500 pF. The maximum length of cable can be worked out from the capacitance specification of the cable being used. For example, EIA Category 5 cable is rated at 17 pF/ft so the maximum cable length will be 2500/17 = 147 ft (approx. 45 m). The maximum data rate for RS232 is 20 kbits/s (i.e. 19K2). As a general rule, cable length may double if the data rate halves.

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