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Configuring the host computer port – Siemens SIMATIC TIWAY 1 User Manual

Page 71

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CONFIGURING THE HOST COMPUTER PORT

UNILINK HOST ADAPTER

3–13

USER MANUAL

Next set the positions on Dipswitch 2 to correspond with the communication
parameters set for the host computer. The adapter always communicates with
the host computer using seven data bits, one start bit, and one stop bit. The baud
rate settings for Positions 5–8 of Dipswitch 2 are shown in Table 3–2.

Position 1 of Dipswitch 2 enables or disables parity bit generation and
checking.

Position 2 of Dipswitch 2 selects even or odd parity when parity
generation and checking is enabled.

Position 3 of Dipswitch 2 selects full duplex or half duplex operation.

Position 4 of Dipswitch 2 selects synchronous or asynchronous modem
communications. Selecting synchronous only enables the adapter to use
the TxCLK (DD) and RxCLK (DB) RS–232–C control signals. The
adapter will not process synchronous control characters from
synchronous data link protocols such as BiSync.

Table 3–2

Host Port Baud Rates

Dipswitch 2

Switches

Baud Rate

0
0
0
0
1
1
1
1
1
1

1

0

0

5

6

7

8

MSB

LSB

1
1
1
0
0
0
0
1
1

0
1
1
0
0
1
1
0
0

1
0
1
0
1
0
1
0
1

110

150
300
600

1200
2400
4800
9600

19200
38400

0

=

Down

1

=

Up