Lexmark Optra T614 Technical Reference - Page 349
Parity, Data Flow Control Protocol
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8-46 Interfaces Parity There are four possible parity settings: Odd, Even, None, and Ignore. Odd Even None Ignore The port expects to receive data frames with an odd number of logical 1's per byte. The printer transmits XOFF and XON with odd parity. If the printer detects a parity error, the port sends X'5F' to the printer instead of the character sent by the host system. The port expects to receive data frames with an even number of logical 1's per byte. The port transmits XOFF and XON with even parity. If the port detects a parity error, the port sends an inverted question mark to the printer instead of the character sent by the host system. The port expects no parity bit when it receives data. The port transmits XON and XOFF without parity bits. The port expects a parity bit when the port receives a data frame. The port ignores the parity bit. The port uses even parity when it transmits XON and XOFF. Some printers post a 54 Standard Serial Error or a 54 Serial Option x Error (x represents the number of the serial port) the first time they detect a transmission error (parity, overrun, or framing). The 54 Standard Serial Error or the 54 Serial Option x Error can be reset from your printer operator panel or through MarkVision. Refer to your printer user documentation for more information. If repeated serial errors occur, power the printer off and back on to restore proper serial operation. Data Flow Control Protocol One data flow control protocol is available: XON/XOFF with programmable polarity. Refer to your printer user documentation for more information about selecting the protocol from your printer operator panel or through MarkVision.