7.8
RS232 Command set
It’s possible to control the DV1394Pro SDI via RS232. The Baud rate is fixed at 56700
Baud, 8 bit 1 stop bit, no parity. You’ll need a one-to-one cable with a female connector
for the PC side and a male connector for the DV1394Pro SDI side. The pinout of the
cable is as follows:
Pin 2 – 2, RXD
Pin 3 – 3, TXD
Pin 5 – 5, GND
The commands via the RS232 port override the settings made via the switches on the
front of the device. On the other hand, the settings via the front switches also override
the RS232 settings. In other words, the last setting change is the controlling factor
regardless of whether it is made from the RS-232 port or the front panel.
Commands are available to recover back the settings stored in the DV1394 Pro SDI.
The values are stored in the DV1394Pro SDI in an EEProm and will be valid even after
a power down and until they are changed again. Also a firmware upgrade via RS232
won’t change these settings.
Values in this doc are given decimal. Hex values are shown as 0xAA or similar.
7.8.1 Data
format
Transmitting data to the DV1394Pro SDI:
The data format is as follows:
1. Start byte: 0xAA
2. command group byte: command group
3. Command byte: command code
4. data bytes: value (optional)
5. checksum: (command group byte + command byte + data bytes (optional)) & 0xFF
The checksum byte is simply added the three bytes. The command group and
command byte are mandatory. The data is not necessary for the read back functionality.
Overflow or carry bits are ignored, since it is only an eight bit value.
The DV1394Pro SDI returns the data as it was sent for control purposes. If the
command value requests a status or time code or other value, the data byte contains
this value. If only a command was sent to DV1394Pro SDI which is not requesting any
information, the value is returned as it was. The DV1394Pro SDI returns 0xFF as return
value, if the command is not implemented or out of range.
The data format is as follows:
1. Start byte: 0xAA
26
Содержание DV-1394 Pro-SDI
Страница 1: ...Instruction Manual DV 1394 Pro SDI Analog Converter...
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Страница 29: ...If no return value is given it returns the value written 29...
Страница 34: ...Notes 34...
Страница 35: ...Notes 35...
