A&D AD-8922A, Instruction Manual

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15
７
RS-232C SERIAL INTERFACE
RS-232C
Transmission system : EIA RS-232C
Transmission form : Asynchronous, bi-directional, half duplex
Data format : Baud rate : 600, 1200, 2400, 4800, 9600, 19200 bps
Data bits : 7 bits or 8 bits
Parity bit : EVEN, ODD (Data bits 7 bits)
NONE (Data bits 8 bits)
Stop bits : 1 bit or 2 bits
Code : ASCII
Terminator : <CR> or <CR><LF>
Circuit
Connection to the weighing instrument Connection to an external device
D-Sub 9-pin DIN 8-pin
Pin
No.
Signal
name
Direction Description
Pin
No.
Signal
name
Direction Description
1 (Vs)
⎯
Used internally 1 FG
⎯
Frame ground
2 RXD Input Receive data 2 RXD Input Receive data
3 TXD Output Transmit data 3 TXD Output Transmit data
4
⎯ ⎯
N.C. 4 RTS Input Request to send
5 SG
⎯
Signal ground 5 SG
⎯
Signal ground
6 DSR Input Data set ready 6 CTS Output Clear to send
7 RTS Output Request to send 7 DSR Output Data set ready
8 CTS Input Clear to send 8
⎯ ⎯
N.C.
9 (Va)
⎯
Used internally
(The signal names except TXD and RXD
apply to the DTE such as a personal
computer.)
(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.
9 8 7 6
6
1
4
2
5
3
7
SG
CTS
RTS
DSR
FG
TXD RX
D
SG
AD-8922A interior
To a weighing instrument
To an external device such as
a personal computer or a printer
5 4 3 2 1
TXD
RX
D
AD-8922A interior
8
Inch screw thread
(#4-40UNC)
(V
a
)
(Vs
)