Epson 8900 Series manual Baud Rate, Data Bits, Parity, Flow Control

Baud Rate

The baud rate is the rate (in bits per second) at which the interface transfers data. This parameters are 300, 600, 1200, 2400, 4800, 9600, or 19,200 bits per second. The default setting is 9600.

Note: Data transferred over a serial interface consists of either 7- or 8-bit data bytes, each of which is accompanied by a start bit, a stop bit, and a parity bit. The values chosen for the data bits and parity parameters depend upon the requirements of the host. (See Chapters 3 and 10.)

Data Bits

The data bits parameter specifies whether the printer is to print 7- or 8-bit character codes. The default setting is 8. (Refer to Chapters 3 and 10 for information about 7- and 8-bit data.)

Parity

Parity checking (often called simply parity) is a method of verifying that data is not changed in the transfer process. This parameters are None, Odd, Even, Mark, or Space, depending upon the requirements and capabilities of your computer. The default setting is NONE. If the parity bit is selected, it is in addition to the 7 or 8 data bits.

Flow Control

To ensure the orderly flow of data between the host and printer, the host computer establishes a set of rules commonly known as the ready/busy protocol. This protocol allows the printer to notify the host that it is either ready to receive data or that it is busy and cannot receive data. The following paragraphs describe the flow-control parameters.

Printer Setup 2-11