Sam4s ER-5200 Service Manual page 51

7-5 RS-232C & IRC Communication Block Diagram
The CPU is used for serial communication 1,2. And also RS-232C Driver(MAX232), is used to serial communication.
Show following block diagram
CPU
M306800SFP
TRANSMIT ACTION(ECR)
PC
RECEIVE ACTION(ECR)
PC
Note : This is a RS232C H/W Handshaking Waveform between ECR and PC.
SAM4S ER-5200 Series
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CONTROL SIGNAL
Figure 7-11 RS-232C and IRC Communication Block Diagram
DTR(→)
HOST BUSY
RXD(←)
DSR(←)
ECR BUSY
TXD(→)
HOST checks whether the ECR is BUSY.
RS-232C H/W Handshaking method is different between ECR and other peripheral and terminal equipment.
Figure 7-12 RS-232C Waveform
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TXD1,RXD1,DTR1,DSR1
MAX232
DRIVER
TXD2,RXD2,DTR2,DSR2
MAX232
DRIVER
T/RXD+,T/RXD-
IRC
DRIVER
SERIAL I/F PBA
HOST NOT BUSY
ECR transmits a data
ECR checks whether the host is BUSY.
ECR NOT BUSY
HOST transmits a data
7 Special Circuit Description
SERIAL COM1
D-SUB9
SERIAL COM2
D-SUB9
Modular
DSR
HOST BUSY
ECR
TXD
DTR
ECR BUSY
ECR
RXD
7-7