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16. EXTERNAL TERMINAL SPECIFICATIONS
16.1. RS-232C Communication Specifications
The Digital Video Recorder’s RS-232C interface permits remote control using a connected PC.
Note
• Control software is not supplied as standard.
• Communication specifications are those set when the Switcher Synchronization selection on the
Communication Setting Screen is set to "OFF."
• TOA takes no responsibility for any inconvenience or damage to customer hardware or software which may
result from the use of control software based on the specifications described in this section.
16.1.1. The Rules of Overall Communications
1. All communications are established by means of a command from the controller.
2. Responses are always present in mutual communications.
3. The response timeout period is 1 second, and the timeout period between continuous data is 100
milliseconds. When the timeout occurs, the corresponding communications are regarded as failed.
4. Data is only updated when a communication setting content update command is received while in Standby
mode or in Idle and Recording Pause mode. No setting content update commands are accepted during
system activation, error message indication, menu screen display, search screen display, playback,
recording (Include Alarm Recording Setting’s Alarm is set to “VALID.”) or while in timer mode (DEL is
returned).
5. When command operation cannot be performed, received data is discarded and any commands are
regarded as invalid.
16.1.2. Communication Protocol
Transfer System : Start/stop system (asynchronous system), duplex
Parity Bit : Even
Transfer Rate : 9,600, 19,200, 38,400 bps
Code : Binary code
Bit Length : 8 bits
Flow Control : CTS/RTS handshaking, none
Stop Bit : 1
Error Control : None
16.1.3. RS-232C Connector Pin Arrangement
The following table shows the signal name of each pin of the RS-232C D-sub 9P connector.
Signal Name
Pin No.
Unconnected
RXD (Received Data)
TXD (Transmitted Data)
Unconnected
GND
Unconnected
RTS (Request to send)
CTS (Clear to send)
Unconnected
1
2
3
4
5
6
7
8
9
Note: The plug for the RS-232C connector is not supplied with the Digital Video Recorder.
Use a cross cable for the RS-232C interface connection.