Sharp ER-A570, Руководство по обслуживанию

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WHAT IS AN RS-232 INTERFACE?
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EIA (Electronics Industries Association) standard RS-232 is asso-
ciated with the transfer of binary serial data, control signals and
timing signals between modems and data terminals.
•
The RS-232 interface is one of the devices generally used for the
exchange of information between a computer and a peripheral
device.
•
This interface (ER-A5RS) was designed to conform to the EIA
standard, but in particular it was designed for connection between
the ER-A570 and a data processing machine.
•
It becomes necessary to set communication specifications of the
ER-A5RS (e.g. baud rate) matched to those of the data processing
machine, when the ER-A5RS is connected with a data processing
machine that is equipped with the RS-232 interface.
•
The Dip switch on the ER-A5RS interface circuit board must be
used to choose the specifications.
•
Refer to Section 3 "RS-232 Interface Specifications" for details of
communication specifications.
CHAPTER 1. GENERAL
This option (ER-A57R1 and ER-A5RS) is the RS-232 interface option
for the ER-A570 cash register. It enables the ER-A570 to perform
on-line data communications.
When this option is used for on-line data communications, the ER-
A570 can be connected to a host computer. Also, their connection
can be made via modems.
When this option is used together with a multiplexer (to be procured
in the market), it allows the host computer to be connected to more
than one ER-A570.
CHAPTER 2. COMPONENTS
ER-A5RS
NO NAME PARTS CODE Q’ty
1 PWB UNIT C PWB S 7 2 9 2 R C 0 1 1
2
BRACKET
L A N G T 7 4 6 6 R C Z Z 1
3
SCREW (FOR PWB AND
BRACKET)
L X – B Z 6 6 6 5 R C Z Z 2
4
SCREW (FOR HOLDING OF
THE PWB BRACKET, AND
BRACKET TO BRACKET)
L X – B Z 6 7 7 4 R C Z Z 3
5
SCREW (FOR HOLDING OF
THE RS-232 CABLE CORE)
X H B S D 3 0 P 0 8 0 0 0 2
6 WIRING TIE L B N D J 2 0 0 4 S C Z Z 1
7
CLAMP
(FOR RS-232 CABLE)
L H L DW6 8 1 4 R C Z Z 2
8 SPACER P S P A N 7 0 3 9 X C Z Z 1
9
FERRITE CORE
(FOR EXTERNAL CABLE)
R C O R F 6 6 5 8 R C Z Z
2
CHAPTER 3. SPECIFICATIONS OF
RS-232 INTERFACE
1. Online interface
a) Interface : RS-232
b) Duplex type : Half-duplex / Full-duplex
c) Line configuration : Direct connection/Modem connection
d) Data rate : 19200, 9600, 4800, 2400, 1200, 600 and
300 bps
(Programable)
e) Synchronizing mode : Asynchronous
f) Parity check
: Vertical parity check (odd)
g) Code : ASCII
h) Bit sequence : LSB first
i) Data format : 1 start bit + 7 data bits + 1
1 stop bit
j) Protocol : Polling/selecting (Simple procedure)
k) Transmission line :
Cable : Shielded cable
Connector
(ECR
side)
: D-sub 9 pin (female type) connector
Inch pitch (4-40 UNC) lock screw
Connector cover : Shielded cover
The table shows the relationship between the data rate and the rec-
ommended cable length.
Data rate Recommended cable length
19,200 bps 3.75 meters
9,600 bps 7.5 meters
4,800 bps 15 meters
2,400 bps 30 meters
1,200 bps 60 meters
Data-bit Parity-bit Stop-bit
b1 b2 b3 b4 b5 b6 b7 P
Start-bit
2  2