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Chapter 4: Operation
61202.086L1-1 ISU 512 User Manual 23
LCD Window
Displays menu items and messages in 2 lines by 16 characters.
Enter
Selects active menu items. To select a menu item, press the number of the item
to activate. When the menu item is flashing, press Enter to select it. A sub-
menu item is invoked or a configuration parameter is set.
Numeric Keypad
The numeric keypad contains the numbers 0 through 9, which are used to ac-
tivate menu items and enter parameters.
Cancel
Stops the current activity and returns to the previous menu. Repeat until the
desired menu level is reached. When a submenu item is displayed, press Can-
cel to exit the current display and return to the previous menu. Repeat until
the desired menu level is reached.
Up and Down Arrows
Up and Down Arrows scroll through the submenu items available in the cur-
rent menu. Submenu items display two at a time in a circular or wrapping
fashion. When the submenu items are scrolled, they continuously appear
from beginning to end in a forward (Down Arrow) or reverse (Up Arrow) pat-
tern.
LED Description
The LED indicators monitor data flow and display the status of key DTE inter-
face leads described as follows:
RS Request to send.
CS Clear to send. Indicates the ISU 512 is ready to transmit.
TD Transmit data. On when the DTE is transmitting to the
ISU 512.
RD Receive data. On when the ISU 512 is receiving data from
the far end.
CD Carrier detect. Indicates the ISU 512 is connected to a re-
mote unit.
TR Terminal ready from DTE. On when DTR is active at DTE
interface.
SR Data set ready.