Siemens SIMATIC TIWAY 1 User Manual page 60

CONFIGURING THE HOST COMPUTER PORT
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.
Port Port Port Port AC AC
GND
1 2 3 4 NEUT LINE
I/O
1 2 3 4 5
Host Communications Port
A000654
Figure 3–2 Host Communications Port
UNILINK HOST ADAPTER 3–2
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