Samsung SRP-350PG Service Manual - Page 56

RS-232C Communication Block Diagram - printer driver

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7-4 RS-232C Communication Block Diagram 7 Special Circuit Description CPU M30624FPFG TXD,RXD,DTR.DSR MAX232 DRIVER D-SUB25 FEMALE Figure 7-7 RS-232C Communication Block Diagram TRANSMIT (PRINTER) PC(HOST) DTR( ) HOST BUSY RXD( ) HOST NOT BUSY PRT transmits a data HOST BUSY DSR TXD PRINTER RECEIVE (PRINTER) Printer checks whether the host is BUSY. PC(HOST) DSR( ) PRT BUSY TXD( ) PRT NOT BUSY HOST transmits a data PRT BUSY DTR RXD PRINTER HOST checks whether the Printer is BUSY. Figure 7-8 RS-232C Communication Waveform Samsung Electro-Mechanics 7-5

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7 Special Circuit Description
7-5
7-4 RS-232C Communication Block Diagram
±²¸µÌ#,µ³´µ¿´¸¾µÊº¼µ´¸¼³½ÉµÅº¹¹¿À³Å½·³ºÀǵ µ .À¾µ½É´ºµ7!+ÂÆÂ̵˼³Í¸¼%".@ÂÆÂ(&µ³´µ¿´¸¾µ·ºµ´¸¼³½ÉµÅº¹¹¿À³Å½·³ºÀÇ
!²ºÈµÊºÉɺȳÀε$ɺÅ/µ¾³½Î¼½¹
Figure 7-7 RS-232C Communication Block Diagram
Figure 7-8 RS-232C Communication Waveform
TXD,RXD,DTR.DSR
CPU
M30624FPFG
D-SUB25
FEMALE
MAX232
DRIVER
±²³
±²³
±²³
±²³´³µ±
´³µ±
´³µ±
´³µ±
²³´µ¶µ·¸³¹²º»¼¸º½¾¸¿À»²Á
²³´µ¶µ·¸³¹²º»¼¸º½¾¸¿À»²Á
²³´µ¶µ·¸³¹²º»¼¸º½¾¸¿À»²Á
²³´µ¶µ·¸³¹²º»¼¸º½¾¸¿À»²Á
¶²³
¶²³
¶²³
¶²³´³¶±
´³¶±
´³¶±
´³¶±
TRANSMIT (PRINTER)
RECEIVE (PRINTER)
HOST BUSY
Printer checks whether the host is BUSY.
PRT transmits a data
HOST NOT BUSY
RXD(
±
)
PC(HOST)
PRINTER
DTR(
²
)
DSR
TXD
HOST BUSY
PRT BUSY
HOST checks whether the Printer is BUSY.
HOST transmits a data
PRT NOT BUSY
TXD(
²
)
PC(HOST)
PRINTER
DSR(
±
)
DTR
RXD
PRT BUSY
Samsung Electro-M
e
chanics