3M Dynapro ET 3170 Terminal Series B, Руководство по установке

Страница: 71 / 125

3M Touch Systems Proprietary Information
35
Configuring
Address allows you to set the following addresses:
!
RS-232 (Default)
!
RS-422 (RS-422 is also the setting for RS-485)
A multi-drop address is not available with the ET 3170 terminal.
Baud Rate
sets the data transmission and reception speed to one of eight baud
rates. Note that the baud setting selects both transmit and receive speeds. With the
ET 3170 terminal, you cannot transmit at one speed and receive at another speed.
!
9600 (Default)
!
110
!
300
!
600
!
1200
!
2400
!
4800
!
19200
Data Bits allows you to set the number of data bits per ASCII code for sending
and receiving data:
!
8 (Default) : After a start bit is received, the next eight bits are interpreted as
data. Operation with eight data bits allows the host computer to directly
address both the Standard Character Set and the Extended Character Set
!
7: After a start bit is received, only the next seven bits are interpreted as data.
Operation with seven data bits allows direct addressing of only the Standard
Character Set and requires the host to use the Select Character Set command
to display the Extended Character Set.
Parity
The Parity Enable and Parity Sense parameters are used to enable or disable parity
checking and to choose odd or even parity. Parity checking is a method of
detecting communication errors. By setting these two parameters, a parity bit can
be used in five different ways, as shown in Table H.
!
Parity enable
!
Off (Default) .
!
On. When parity checking is on, the terminal tests each received code for
correct parity. A parity bit is appended to the data bits of each transmitted
code and checked on each code received.
If a code fails the parity test, the terminal prints the parity error character
(PE) on the screen and logs an error message in the Operational Status
Window.
!
Ignore
Important
The keyboard displayed by the Keyboard Test reflects the NRC selected so you can easily
identify the characters used by the selected NRC and keys under which these characters
reside. See “Keyboard Test” in this chapter.