Sanyo DSR-3016 - Manual (Page 92)

INTERFACE SPECIFICATIONS
RS-232C
9-pin connector specifications
Pin No. Signal Operation Signal direction
1 – – –
2 RXD Receive data Computer → Digital video
recorder
3 TXD Transmit data Digital video recorder
→
Computer
4 – – –
5 GND Ground –
6 – – –
7 RTS Request to
send
Digital video recorder →
Computer
8 – – –
9 – – –
Data format
Mode Asynchronous
Character length 8 bits
Data transmit speed 2400, 4800, 9600, 19200 bps
Parity None
Stop bit 1
Communication protocol
Communication is carried out in units of 1 byte. After the computer
transmits one byte of data, it waits for a response from the digital
video recorder, and then transmits the next byte of data.
To start sending commands, an ON (F6) command is sent. The digital
video recorder will continue to receive commands until an OFF (F7)
command is sent to stop. The digital video recorder sends an ACK
(OA) each time it receives a command.
See Table 4 - Command Table on page 71.
RS-485
Data format
Mode Asynchronous
Character length 8 bits
Data transmit speed 2400, 4800, 9600, 19200 bps
Parity None
Stop bit 1
Communication protocol
A proprietary Sanyo protocol (SSP: Security Serial Protocol) is used. It
is recommended that a special controller be used. Contact the place
of purchase for further details on obtaining a special controller.
RS485 termination switch settings (RS485
TERMINATE)
Termination setting
If several unit are being connected together, termination settings must
also be made.
•
Set the RS485 termination switch on the rear panel to ON, and set
the termination switch of the last device in the series to ON.
•
Be sure to set the RS485 termination switches of all devices in
between (devices other than the first and last in the series) to OFF.
Note: If the termination settings are not correct, data will be reflected
by either end of the series and this will affect the transmission
of other data, so that the data that is transmitted to each device
will not be correct.
(Example)
9 8 7 6
5 4 3 2 1
12V DC IN
POWER
ON
OFF
RS485 GND
1
0
A
A
B
B ADDRESS
TERMINATE
1 2 3
Digital video recorder
Digital video recorder
Termination switch
OFF
ON
System controller
OFF
ON
RS485
TERMINATE
OFF
ON
RS485
TERMINATE
English 91