MERLIN LEGEND Communications System Release 6.1
System Programming Guide
555-661-111
Issue 1
August 1998
Programming with SPM
Page 2-16Connecting the PC
2
Remote Modem Connection 2
For a remote modem connection, you must use a modem (either connected to, or
built into, the PC) to access the internal modem in the control unit. You must also
use a dial-up connection, as shown in Figure 2–4
. See “Accessing SPM” on page
2–17 for details on accessing SPM with a remote modem connection.
The internal modem operates at speeds of 1,200 and 2,400 bps.
Figure 2–4. Remote Modem Connection
NOTE:NOTE:NOTE:
Remote access (modem connection) has priority over local access (direct
connection), unless a backup or restore procedure is in progress through a
direct local connection. If a modem connection is attempted while any other
type of onsite programming is in progress (either at the system or at a
directly-connected PC), the system sends a message to the onsite
programmer. The message indicates that a modem connection is being
established and the onsite programming session is terminated.
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PROCESSOR
RS-232
Serial
Communications
Port
Incoming
trunk line
Public or private
telephone network
MODEM