Siemens SIMATIC TIWAY 1 - Manual (Page 59)

UNILINK HOST ADAPTER 3–1
USER MANUAL
CHAPTER 3
CONFIGURING THE
HOST COMPUTER PORT
3.1 THE HOST COMPUTER INTERFACE
The UNILINK Host Adapter communicates with a wide range of host computer
devices through a serial binary data interface using EIA RS–232–C control
signals and EIA RS–423–A drivers as illustrated in Figure 3–1. This port is
configurable for baud rates up to 38.4K bits per second; synchronous or
asynchronous modem operation; full or half duplex; and even, odd, or no parity.
A choice of two data link protocols are available; the Non–Intelligent Terminal
Protocol (NITP) or BDLC, a byte-oriented subset of the ANSI X3.66 standard
protocol.
Host
Computer UNILINK
RS–232–C/RS–423–A
Figure 3–1 Host Computer Interface