Chapter 3. Specifications Of Rs-232 Interface; Chapter 4. Signal Connection Diagram - Sharp ER-A440 Service Manual

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 parity +
1 stop bit
b1 b2 b3
Start-bit
j) Protocol : Polling/selecting (Simple procedure)
k) Transmission line :
Cable : Shielded cable
Connector : D-sub 9 pin (female type) connector
(ECR side) 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
19,200 bps
9,600 bps
4,800 bps
2,400 bps
1,200 bps
b4 b5 b6 b7 P
Data-bit Parity-bit Stop-bit
Recommended cable length
3.75 meters
7.5 meters
15 meters
30 meters
60 meters
CHAPTER 4. SIGNAL CONNECTION
DIAGRAM
1. Connection between the master (Host)
and Satellite
25PIN D-SUB
HOST
SD 2
3
RD
RTS 4
DCD 8
DTR 20
DSR 6
CTS 5
SG 7
FG 1
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
If the connector of Host side is "9 PIN D-SUB", the pin number is
same as Satellite side.
– 2 –
9PIN D-SUB
SATELLITE
3 SD
2
RD
7 RTS
1 DCD
4 DTR
6 DSR
8 CTS
5 SG
FRAME GROUND is connected
to the shield of the cable.