Lexmark C720 User's Guide - Page 217
Transmit Delay, Window Size
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See also: PCL SmartSwitch; Printer Language Transmit Delay Purpose: To define the amount of time, in seconds, the printer must wait before transmitting meaningful infrared data to the host computer, as well as the amount of time the printer requests that the host computer wait before transmitting infrared data. Values: Auto* None 1...15 Printer sets the Transmit Delay value during a power on reset to maximize link performance (recommended). No delay is imposed by the printer. However, not all host computers can communicate without some transmission delays. User selects a Transmit Delay value between 1 and 15 seconds. If you have trouble printing using the infrared port, selecting a high Transmit Delay value, such as 15, may resolve the problem. Window Size Purpose: To specify the maximum number of infrared frames the printer can receive before sending an acknowledgment to the host computer. Values: Auto* 1 Printer sets the Window Size value during a power on reset to maximize link performance (recommended). User sets the Window Size to one frame (1). If you have trouble printing using the infrared port, changing the Window Size menu item to 1 may resolve the problem. 217