Date Code 20010518 Commands 5-15
SEL-2020 Instruction Manual
PORT n (Access Level 1)
The PORT command connects the master port issuing the command to the designated port,
permitting transparent communication between the two ports. To terminate transparent
communications and return to SEL-2020 command operation, use the disconnect sequence set for
your port. You cannot connect to a port that is already communicating transparently.
The following example illustrates using the PORT command to enter and exit transparent
communications:
*>>PORT 9<ENTER>
*>>PORT 9<ENTER>*>>PORT 9<ENTER>
*>>PORT 9<ENTER>
Transparent Communications to Port 9 established
<CTRL
<CTRL<CTRL
<CTRL-
--
-D>
D>D>
D>
Transparent Communications to Port 9 terminated
*>>
This example uses the default termination character <CTRL-D> to exit transparent communica-
tions. You can set the termination string on the master port using the TERSTRING setting
within the SET P command.
When connecting to a printer port, you may add an E parameter to enable echoing from the
SEL-2020 (e.g., PORT 5 E). Using this parameter, you can see what you are sending to the
printer, but you will not see any messages sent to you by the printer.
To select the Direct Transparent mode, add the D parameter to the Port command (Port n D,
where n selects the port number). The Direct Transparent mode passes characters through
rapidly, without significant buffering delays.
See Section 6: Settings for a more complete discussion of transparent communications.
QUIT (Access Level 0)
The QUIT command causes the SEL-2020 to return control to Access Level 0 from Level 1 or
Level 2. The command displays the SEL-2020 ID, date, and time of QUIT command execution.
Use this command when you finish communicating with the SEL-2020 to prevent unauthorized
access. Control returns to Access Level 0 automatically after a settable interval with no activity
(see TIMEOUT setting in the SET P subsection of Section 6: Settings). If the port you are
communicating with is using Limited-Multidrop Protocol, the connection is dropped when you
issue the QUIT command. If you are connected to the port through a dial-up modem, the
SEL-2020 will hang up the modem when it receives a QUIT command.
SET Commands (Access Level 2)
Use the seven SET command variations to configure the SEL-2020. These seven SET command
variations are listed in Table 5.2 with their parameters, formats, and uses. Table 5.3 lists the
editing keys used with all SET commands. SET M has some additional editing features which
are described in Section 6: Settings.
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