Siemens SIMATIC TIWAY 1 - Manual (Page 60)

CONFIGURING THE HOST COMPUTER PORT
UNILINK HOST ADAPTER 3–2
USER MANUAL
3.2 RS–232–C/RS–423–A PHYSICAL INTERFACE
Port 3 on the UNILINK Host Adapter, shown in Figure 3–2, is a serial
communications interface which implements a subset of RS–232–C control,
data, and timing signals using RS–423–A drivers and receivers. It is a 25-pin
female “D” connector wired as Data Terminal Equipment (DTE) for connection
to Data Communications Equipment (DCE). This connector uses the RS–232–C
Type “D” pin assignments as listed in Table 3–1. Any pins not listed should
remain vacant in order to prevent damage to the host computer or the
UNILINK Host Adapter.
A000654
Port
1
Port
2
Port
3
Port
4
AC
NEUT
AC
LINE
GND
1 2 3 4 5
I/O
Host Communications Port
Figure 3–2 Host Communications Port