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CHAPTER 6 RS-232-C INTERFACE
This chapter describes the RS-232-C interface used for the I/O interface
connected to the M304x series line printer (printer). The printer conforms
with the EIA RS-232-C interface logical level and has various functions.
6.1 Operation
Outline
The basic printer functions are as follows:
-
Feeds forms according to Line Feed
(LF),
Carriage.Return (CR), Forms Feed
(FF),
and Vertical Tab (VT) codes.
-
Downloads the forms control buffer
(FCB)
data from the host sent with the
Load FCB Data command.
-
Feeds forms as specified by the Space
n
Line command or the Skip to Channel
n
command.
The printer receives serial data transmitted from the host, assembles it in to
'I-bit or 8-bit data, checks for even, odd, or no parity, and writes the data in
the
2K-byte
interface buffer. The interface buffer state is transmitted to the
host by using the Reverse Channel signal
(SCA
or
SRS)
or the XON/XOFF code.
Asynchronous data consists of a start bit, 7 or 8 data bits, a parity bit
(unless no parity), and 1, 1.5, or 2 stop bits (Teletype procedure). A band of
2.4, 4.8, 9.6 or 19.2 K can be set for the printer.
Figure 6.1 shows the basic configuration of the RS-232-C interface circuit.
B02P-1500-OOOlA...O5
6
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