Direct Local Connection; Figure 3. Direct Local Connection - AT&T MERLIN LEGEND Release 2.0 System Programming And Maintenance Manual

System Programming and Maintenance (SPM)
In addition, the following equipment is useful:
a parallel printer (the PC needs a parallel port for the connection)
a 1200- or 2400-bps modem
NOTE:
SPM uses Interrupt 4 and I/O address 3F8 for COM1. It uses Interrupt 3
and I/O address 2F8 for COM2.

Direct Local Connection

For a direct local connection, connect the PC to the system programming
jack. This is the lower modular RS-232 jack on the processor module, as
shown in Figure 3. (The upper jack is reserved for the SMDR printer.) For
direct local connections, the system supports speeds of 1200 and 2400 bps.
Use a direct local connection to program in surrogate mode.

Figure 3. Direct Local Connection

Connecting the PC
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