Owner`s manual

39
Once the SELECT switch is released, the Telplex will send a power-
up status message as discussed in Section 4.1.2.4 . Send the Escape
Code Sequence to access System/Local mode. If you access Local
Unit Configuration mode, the status menus will show the values
currently stored in non-volatile memory. The status menus will not
show the temporary changes for Port 1. Cycling power on the Telplex
will cause Port 1 to revert back to the values stored in non-volatile
memory. If you happen to change the serial configuration for Port 1
after you have accessed Local Unit Configuration mode using the fail
safe method, you may save the changes permanently as described in
Section 5.3 .
 
Data flow control between the composite ports of remote Telplex units
is accomplished via internal protocol that is transparent to each
terminal port. However, either Telplex will respond to the hardware
flow control lines of an external modem connected to the composite
port. Each terminal port has a 256 character receive buffer and a
7.5K transmit buffer.
Data flow control for the terminal ports is accomplished by hardware
handshaking (CTS output and DTR input) or XON/XOFF
handshaking. The desired flow control can be enabled on individual
terminal ports in both the transmit data (TX) and receive data (RX)
directions. You may also program individual terminal ports to pass
the status of its RTS input handshake line through to the DSR output
handshake line of the designated remote terminal port.