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Communications 9
In addition to software “receive” flow control (Xon/Xoff), the serial host/printer
ports support “receive” hardware flow control. The SES1-EIA port has an outgoing
DTR (Data Terminal Ready) signal. If “Xon/Xoff” is “DTR” in Setup, and the
terminal’s receive buffer fills to the level mentioned above, the terminal will set the
DTR signal low to inform the host (serial) device to stop sending data.
Host Port 1
This port, labeled “SES1-EIA,” is designed for connection to the host (computer or
modem) via a 25-pin D-shell (DB25) female connector. This port uses an RS-232-C
communication interface, is configured as a DTE (Data Terminal Equipment) device,
and can operate from 110 to 38,400 baud. The pins supported are shown below:
Host Port 1 Pin Assignments