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An RS-232C interface connection with a PC makes it possible to operate this unit via commands.
Conditions for receiving commands
via an RS-232C interface
• The front panel REMOTE button is on.
• If the above condition is not met, [ACK] + [STX] ERR001
[ETX] is returned to external devices.
Hardware Specifications
■ Connector Specifications
Connector: D-SUB 9-pin
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 parameters
Communication system
Communication speed
Bit length
Stop bit
Parity bit
ACK
RS-232C Interface
Asynchronous, full duplex
9600
8 bit
1 bit
None
ACK code returned
Send Format
RS-232C Interface
■ Data format
[STX]
[command]
02h
XX XX XX
20H<XX<7FH
(XX = ASCII code: Symbols, numeric characters,
upper case alphabetic characters)
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.
■ 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.
Connections: RS-232C Interface
[:]
[data]
[ETX]
3Ah
XX.....XX
03h
153
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