BE1-25/79TR Functional Description
3-13
Serial Communication
Front and rear serial port communication cannot take place at the same time. Priority is given to the front
panel port.
If communication is in progress but no keys on the terminal are typed for five minutes, communication is
stopped. A fixed timeout of five minutes in the relay software allows switching devices such as the SEL
PRTU or RFL 9660 switch to regain communication at the rear port in case the front port is left unattended
or connected.
If rear port communication is taking place when the front port is connected, there are two ways to stop rear
port communication and allow front port communication.
1.)Keystroke ESC (to enter the main menu) must be typed on the front (local) terminal/computer.
2.)Keystroke Q (to exit the main menu) must be typed on the rear (remote) terminal/computer.
An XON (Ctrl-Q) may be needed at the front port to start communications if the rear port had recently
received an XOFF (Ctrl-S). To allow rear port communication to continue, the front port must exit from the
main menu with the Q keystroke or allow the five minute timeout to stop communication.
Use built-in functions in the modem software to print screen data or capture data to a file. No special
commands are needed to retrieve data other than a few keystrokes to select the desired screen. Each
screen is displayed by transmitting a series of information strings. The information can be raw data, such
as the text that comprise column titles or escape sequences. Escape sequences are interpreted by the VT-
100 compatible terminal to perform various functions such as clearing the screen, positioning the cursor, set
screen attributes, etc. Lines on a screen can be displayed in any order. In fact, screen information is
displayed in a totally random fashion (bottom lines can be transmitted prior to top lines, right most data can
be displayed prior to left most data). XON (Ctrl-Q) and XOFF (Ctrl-S) can freeze data on the remote terminal
or computer screen as the screen is being updated.
Starting Communication
With a computer or terminal connected to the relay and the modem software operating, begin communication
by pressing the ESC key (refer to Figure 3-9 for screen flow diagram and keystroke sequence). Screen 1,
MAIN MENU, appears on the monitor when communication begins. From this point on, the communication
is menu driven. Select the desired main activity (screen number) to continue or Q to exit. Movement is
made within the screens with standard arrow keys
. To refresh the screen with the latest data, use
Ctrl-R.
Figure 3-9. Communication Terminal Screens Flow Diagram
Summary of Contents for BE1-25/79TR
Page 1: ...05647 6 10 07 14 19 241 5 0 4 15 0 4 64 Publication 9 2787 00 990 Revision B 07 95...
Page 27: ...BE1 25 79TR Controls and Indicators 2 7 Figure 2 7 Front Panel Vertical Mount Relay...
Page 29: ...BE1 25 79TR Functional Description 3 2 Figure 3 1 Functional Block Diagram...
Page 60: ...BE1 25 79TR Installation 4 8 Figure 4 9 RS 232 Interconnection Diagram For IBM Type Computers...
Page 63: ...BE1 25 79TR Testing 5 2 REAR VIEW FRONT VIEW Figure 5 1 BE1 25 79TR Test Simulator...
Page 64: ...BE1 25 79TR Testing 5 3 Figure 5 2 BE1 25 79TR Test Simulator Schematic Diagram Sheet 1 of 2...
Page 65: ...BE1 25 79TR Testing 5 4 Figure 5 3 BE1 25 79TR Test Simulator Schematic Diagram Sheet 2 of 2...
Page 66: ...BE1 25 79TR Testing 5 5 Figure 5 4 Test Setup Diagram...