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７ RS-232C SERIAL INTERFACE
RS-232C
Transmission system
Transmission form
Data format
Circuit
SG
AD-8922A interior
5 4 3 2 1
9 8 7 6
To a weighing instrument
Connection to the weighing instrument
D-Sub 9-pin
Pin
Signal
Direction
No.
name
1
(Vs)
2
RXD
3
TXD
Output
⎯
4
5
SG
6
DSR
7
RTS
Output
8
CTS
9
(Va)
(AD-8922A is a DTE. Connects to a DCE
such as a weighing instrument using a
straight through cable.)
When making the cable yourself, do not
connect to the internally used terminals.
:
EIA RS-232C
:
Asynchronous, bi-directional, half duplex
:
Baud rate
Data bits
Parity bit
Stop bits
Code
Terminator
Inch screw thread
(#4-40UNC)
Description
⎯
Used internally
Input
Receive data
Transmit data
⎯
N.C.
⎯
Signal ground
Input
Data set ready
Request to send
Input
Clear to send
⎯
Used internally
:
600, 1200, 2400, 4800, 9600, 19200 bps
:
7 bits or 8 bits
:
EVEN, ODD
NONE
(Data bits 8 bits)
:
1 bit or 2 bits
:
ASCII
:
<CR> or <CR><LF>
CTS
RTS
DSR
TXD
SG
7
8
3
5
2
To an external device such as
a personal computer or a printer
Connection to an external device
DIN 8-pin
Pin
Signal
No.
name
1
FG
2
RXD
3
TXD
4
RTS
5
SG
6
CTS
7
DSR
⎯
8
(The signal names except TXD and RXD
apply to the DTE such as a personal
computer.)
15
(Data bits 7 bits)
FG
AD-8922A interior
6
1
4
Direction
Description
⎯
Frame ground
Input
Receive data
Output
Transmit data
Input
Request to send
⎯
Signal ground
Output
Clear to send
Output
Data set ready
⎯
N.C.
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