Sam4s ER-5200M Service Manual

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

Sam4s ER-5200M Specifications

General

Brand	Sam4s
Model	ER-5200M
Category	Cash Register
Language	English