User Guide

Revision1.0 DN-C635 Serial Interface Specification
Date 2003-01-28 4 page of 39
1 Serial communication interface
1.1 Physical interface
a) DN-C635 has pin Dsub female connector for serial interface.
b) Table 1 indicates pin assignment of connector signals. RS-232C and RS-422A can be selected with
software switch on DN-C635.
RS-232C RS-422A
Terminal # Signal I/O Signal I/O
1NC-NC-
2 TxD O TxD- O
3 RxD I RxD I
4NC-NC-
5 S.GROUND - S.GROUND -
6NC-NC-
7NC-TXDO
8 NC - RXD- I
9NC-NC-
Table 1. Pin Assignment
c) Figure 1 indicates diagram of RS232C and RS422A.
RS-232C RS-422A
Figure 1. Serial Driver/Receiver
RXD
CPU
TXD
CPU
TXD+
TXD-
RXD+
RXD-