Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 25)

Chapter 2
Installing a Network
2–12
5. Press < – until the parity is the SAME AS THE PARITY SETTING ON
THE HOST COMPUTER. A selection of “EVEN” is commonly used.
③
Press ENTER; “Comm Stop Bits” will appear.
6. Press < – until “One” appears.
④
Press ENTER; “Comm CRLF” will appear.
7. Press < – until “ENABLED” appears.
⑤
Press ENTER; “Comm Echo” will appear.
8. Press < – until “ENABLED” appears.
⑥
Press EXIT; “1-Network Menu” will appear.
9. Press OUT; “Diagnostics” will appear.
Press ENTER; Press < – until “Comm Rx Test” appears.
Press ENTER;
10. The following should appear on the two line display:
DTR: ON CD: ON
Pressing the number 1 and 2 will turn DTR ON and OFF.
⑦
11. Start the communication program on the Host computer. If the program is
an asynchronous terminal emulator program, then characters that are
typed on the computer are sent directly over the communication line.
These characters should appear on the top line of the workstation
display.
⑧
12. Press EXIT; “Comm Rx Test” will appear.
Press OUT; “Comm Tx Test” will appear.
Press ENTER; The top line will be blank and the second line will show:
DTR: ON CD: ON
The Host computer should be receiving a continuous transmission of
③ If the parity is set incorrectly, the workstation will still RECEIVE characters properly. Your Host computer may not
receive correctly, if at all.
④ If the baud rate is incorrectly set, when your computer sends characters to the workstation, unpredictable
characters will show up on the display when you are in “COMM RECEIVE TEST” mode. In some cases NO
character will show up if the baud rate is improperly set.
⑤ If you find that your computer is receiving double spaced lines from the workstation, then set CRLF to
DISABLED. Also disable when using Network Manager Software (Catalog No. 2708-NNM) or similar software.
⑥ If you find that when you are using your workstation program, you see two characters for each one you type
(such as DDIISSPPLLAAYY//HHEELLOO//) then set Com Echo to DISABLED. Note that when using a data
collection program (such as Network Manager Software (Catalog No. 2708-NNM) you will also DISABLE this
option.
⑦ Your computer may be unwilling to transmit characters unless these RS-232 lines are in the proper state. If you
are having trouble communicating, check your cable diagram against the specifications for your computer’s
RS-232 port. Additionially, the workstation requires CD to be high (or on) for communications.
⑧ Random characters on your computer or the workstation display indicate the baud rate is wrong. If about half of
the characters are wrong or missing, the parity is set incorrectly. If nothing at all happens, the cable is wrong or
something is broken.