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Connections: RS-232C Interface
RS-232C Interface
An RS-232C interface connection with a PC makes it possible to operate this unit via commands.
• The front panel REMOTE button is on.
• If the above condition is not met, [ACK] + [STX] ERR001
[ETX] is returned to external devices.
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Connector Specifications
Connector: D-SUB 9-pin
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Communication parameters
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Data format
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Outline of send procedure from controller
The send command starts with STX (start of text = 02h). The
command is then identified by COMMAND, which follows,
and the required amount of data. The format ends with ETX
(end of text = 03h).
Additional commands are sent upon receiving a response
from the recorder.
If an additional STX is received prior to sending ETX, the
reception data buffer in the recorder is cleared. An error is
then returned to the controller, the data is then processed
again after receiving data starting with STX.
Conditions for receiving commands
via an RS-232C interface
Hardware Specifications
Pin No.
Signal
Description
1
(Not used)
2
TXD
Transmitted data
(data received from PC)
3
RXD
Received data (data sent to PC)
4
DSR
Data set ready
(Positive voltage output announces
communication ready status)
5
SG
Signal ground (signal GND)
6
DTR
Data terminal ready (no processing)
7
CTS
Clear to send (shorted with pin 8)
8
RTS
Request to send (shorted with pin 7)
9
(Not used)
Software Specifications (Protocol)
Communication system
Asynchronous, full duplex
Communication speed
9600
Bit length
8 bit
Stop bit
1 bit
Parity bit
None
ACK
ACK code returned
Send Format
command
A 3-byte command identifier. Sends a 3-byte
identifier as a command (ASCII code:
symbols, numeric characters, alphabetic
upper case characters).
:
Colons delimits commands and data.
data
The required amount of data (ASCII code:
symbols, numeric characters, alphabetic
upper case characters) can be added.
RS-232C Interface
[STX]
02h
20H<XX<7FH
03h
3Ah
XX XX XX
XX.....XX
[command]
[data]
[ETX]
[:]
(XX = ASCII code: Symbols, numeric characters,
upper case alphabetic characters)
