Table 3-7: The Purposes Of Com1/Com2 (Xp3 And Xp6) Connectors Contacts; Table 3-8: The Purposes Of Com3 And Com4 Connectors (Xp17 And Xp18) Contacts; Fig. 3-10: Com1/Com2 (Xp3 And Xp6) Connectors; Fig. 3-11: Com3 And Com4 Ports Connectors (Xp17 And Xp18) - Fastwel CPC308 User Manual

СРС308 Processor Module

Fig. 3-10: COM1/COM2 (XP3 and XP6) Connectors

Table 3 7: The Designation of COM1/COM2 (XP3 and XP6) Connectors Contacts
-
When using XP3 and XP6 (IDC10) connectors, it is also recommended to use the ACS00040-01
additional accessory (see Table 1 3).
3.4.4.2 COM3 and COM4 Ports
Serial ports COM3 and COM4 are intended for operation in RS422/485 interface modes. They
have galvanic isolation (500V optoisolation). The ports have standard PC/AT base addresses and
interrupts. The maximum data exchange rate is 921 Kbit/s. In Rs485 mode, transmitters are
controlled automatically. Each port can operate both with the receiver permanently enabled (ECHO
mode) and with the receiver disabled at the moment of the data transmission.
The ECHO mode is disabled, and the 120 Ohm terminating resistors (terminators) are control for
each port with the help of the BIOS Setup program.
Each port is connected to a straight 5-contact connector with 2 mm contact spacing.

Fig. 3-11: COM3 and COM4 Ports Connectors (XP17 and XP18)

The designation of the connectors contacts are shown below.
Table 3 8: The Designation of COM3 and COM4 Connectors (XP17 and XP18) Contacts
-
The connection diagrams explaining the structure of RS422 and RS485 interfaces are shown,
respectively, in Fig. 3 12 and Fig. 3 13.
"Point-to-point" connection of two devices through RS422 interface is shown in Fig. 3 12. The
terminator is installed on the receiving side (on RX+ and RX- lines). The integration of several devices
C P C 3 0 8 U s e r M a n u a l
The Module Structure and Functioning
© 2 0 1 3
F a s t w e l V e r . 0 0 1 b E
33