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For parallel printers, this terminal monitors the BUSY and ERROR 
signals which are sent by the printer to determine when data 
transmission should be stopped or resumed. 
 
Host/Printer Port 1 
This port, labeled “SES1-EIA,” is designed for connection to the 
host (computer or modem) or a serial printer via a 25-pin D-shell 
(DB25P) 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 134,400 baud.  
The pins supported are shown below: 
 
Host/Printer Port 1 Pin Assignments 
Host/Printer Port 2 
This port, labeled “SES2-AUX,”  is designed to connect to a host 
connection (computer or modem) or a serial printer, and can 
operate from 110 to 38,400 baud.  This port uses an RS-232-C 
interface via a DB25P female connector, and is configured as a 
DCE (Data Communication Equipment) device.  The pin 
assignments for this port are shown below: