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8-22
Start and Stop Bits
The printer receives data with 1 start bit and either 1 or 2 stop bits. The printer always
sends 1 start and 2 stop bits.
Parity
There are four possible parity settings: Odd, Even, None, and Ignore.
Odd 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.
Even 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.
None The port expects no parity bit when it receives data. The port transmits
XON and XOFF without parity bits.
Ignore 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 the printer operator panel or through MarkVision Professional. See your
printer documentation for more information.
If repeated serial errors occur, power the printer off and then back on to restore proper
serial operation.