Lexmark 248X, 249X Serial Computer Configuration Recommendations RS-232C, 103, OS/2 1.2, OS/2 2.0

2Because all data transmissions require CTS, it must be detected prior to the XON/XOFF protocol initiating. Once CTS is detected, after POR, the printer transmits an XON command. It is not necessary for the host to detect this initial XON command prior to transmitting data to the printer.

3The printer transmits an XOFF command to the host when the receive buffer is full.

4The printer transmits an XON command to the host when buffer space becomes available and the printer is ready to receive more data.

Serial Computer Configuration Recommendations (RS-232C)

For the correct operation of the serial adapter, you must configure the operating system of the computer. The following examples show how to configure DOS and OS/2 for the printer using serial DTR protocol.

DOS

From the DOS prompt, enter the following commands:

mode com1:9600,n,8,1

Include this command statement in the AUTOEXEC.BAT file on the computer so it runs each time your system starts operating.

OS/2 1.2 and 1.3

1 From Desktop Manager or Group Utilities, select Utilities. 2 Select Control Panel.

3 Select Options.

4 Select Communications Port.

5 For the port you wish to set up, set the following parameters to match the printer defaults.

Baud rate = 9600 Word length = 8 Parity = none Stop bits =1 Handshake = hardware

6 Select Set.

OS/2 2.0 and 2.1

Make sure the OS/2 serial port settings match the switch settings on the serial adapter. To view or to change the settings:

Section 6: Using the Printer Interface 103