1269 User Manual
Configuring The 1269 2-24
Connecting The
RS-232 Interface
Omit this procedure if your mainframe is not equipped with the
Enhanced Monitoring System (EMS).
The 1269 EMS
RS-232 port may be connected to a computer,
data terminal, or modem. Note that the RS-232 connector on
the 1269 is a female, DB-09. If you do not intend to use the
RS-232 port, omit this procedure.
Connecting To a
Computer, Data
Terminal, or Modem
Use an RS-232 cable to connect J412 (9-pin female RS-232
connector) on the EMS rear panel to the RS-232 serial port on
the host controller. Refer to
Figure 2-17 Setting Up the
Enhanced Monitoring System (EMS) RS-232 Interface,
and
to
Figure 2-18 RS-232 Cable Connections With a
Computer, Data Terminal, or modem.
RS-232 Flow Control
Method
Flow control is a means by which the host computer (or other
controller) may pace the flow of data coming from the 1269
EMS Monitor so that the host controller has time to properly
receive the data. It also allows the 1269 EMS Monitor to pace
commands coming from the host computer so that the 1269
EMS Monitor has sufficient time to execute the commands as
they arrive.
The 1269 EMS RS-232 interface uses only “Software” flow
control or “XON/XOFF”. The host controller RS-232 flow
control must be set for “Software” or “XON/XOFF”.
With software flow control, as implemented in the 1269 EMS
Monitor, an RS-232 device that is receiving data may send an
XOFF character (ASCII 19
10
) to the sending device,
commanding the sending device to suspend data output.
Later, when the receiving device is ready for more data, it may
send an XON character (ASCII 17
10
) to the sending device,
indicating that data transmission may be resumed.
If your controller does not support flow control, it will not send
or respond to XON or XOFF characters and flow control will
thus be non-existent. Note that operating without flow control
may necessitate a slower baud rate in order to avoid data
overrun problems.
Feed RS-232 Echo
Back And Line
Considerations
The 1269 EMS Monitor will not echo back characters it
receives from the terminal. If you wish to see characters on
your terminal as you type them, set your terminal for “Local
Echo”.
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