Read Sharp ER-A490 (serv.man4) Service Manual online
CHAPTER 4. BLOCK DIAGRAM
AND SYSTEM CONFIGURATION
AND SYSTEM CONFIGURATION
1. System Configuration
1) On-line data communication
On-line data communication is allowed only when the ER-A490 is a
stand-alone machine or an in-line master. The protocol is the simple
procedure. (The on-line option is not usable if the ER-A490 is an
in-line satellite.)
stand-alone machine or an in-line master. The protocol is the simple
procedure. (The on-line option is not usable if the ER-A490 is an
in-line satellite.)
1
Direct connection
a) One-to-one connection
2
Connection via modems
a) One-to-one connection
CHAPTER 5. SIGNAL CONNECTION
DIAGRAM
DIAGRAM
1. Connection between the master (Host)
and Satellite
SD : TRANSMITTED DATA
RD : RECEIVED DATA
DTR : DATA TERMINAL READY
DSR : DATA SET READY
RTS : REQUEST TO SEND
DCD: DATA CARRIER DETECTOR
CTS : CLEAR TO SEND
FG : FRAME GROUND
RD : RECEIVED DATA
DTR : DATA TERMINAL READY
DSR : DATA SET READY
RTS : REQUEST TO SEND
DCD: DATA CARRIER DETECTOR
CTS : CLEAR TO SEND
FG : FRAME GROUND
*
If the connector of Host side is "9 PIN D-SUB", the pin number is
same as Satellite side.
same as Satellite side.
Satellite
Host computer
ER-A490
The ER-A49R1 and ER-A5RS are Installed in ER-A490.
(The same applies to the sample connections shown
below.)
(The same applies to the sample connections shown
below.)
MODEM NCU
Satellite
Host computer
NCU MODEM
To be procured in the market
ER-A490
SD
2
SD
RD
CTS
RD
3
6
5
3
2
6
8
HOST
7
5
SG
RTS
4
DCD
8
DTR
20
DSR
7
1
4
SATELLITE
CTS
SG
RTS
DCD
DTR
DSR
1
FG
FRAME GROUND is connected
to the shield of the cable.
to the shield of the cable.
25PIN D-SUB
9PIN D-SUB
1 – 3
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