Sony SRG120DH Technical Manual - Page 22

Command List VISCA1) RS-232 Commands Use of RS-232 control software based upon this command list may cause malfunction or damage to hardware and software. Sony Corporation is not liable for any such damage. Overview of VISCA In VISCA, the device outputting the commands, for example, a computer, is called the controller, while the device receiving the commands, such as this unit, is called the peripheral device. In VISCA, up to seven peripheral devices can be connected to one controller using communication conforming to the RS232 standard. The parameters of RS-232 are as follows. • Communication speed: 9600 bps/38400 bps • Data bits : 8 • Start bit : 1 • Stop bit : 1 • Non parity Flow control using XON/XOFF and RTS/CTS, etc., is not supported. Peripheral devices are connected in a daisy chain. As shown in Fig. 1, the actual internal connection is a onedirection ring, so that messages return to the controller via the peripheral devices. The device address is assigned to each device on the network. The address of the controller is fixed at 0. Each VISCA equipment has VISCA IN and VISCA OUT connectors. Set the DTR input (the S output of the controller) of VISCA IN to H when controlling VISCA equipment from the controller. Note When connecting in a daisy chain using this unit, set the VISCA/ LAN switch and BAUD RATE SELECT switch correctly. In case that any device having different setting is connected in a daisy chain, the devices do not operate correctly. Fig. 1 VISCA daisy chain connection VISCA Controller VISCA Equipment IN OUT IN OUT IN OUT ...1) VISCA is a protocol developed by Sony for controlling a consumer's camcorder. "VISCA" is a trademark of Sony Corporation. 22