Sony EVID70/W Technical Manual - Page 31

Command List Command List VISCA1) RS-232C/RS422 Commands Use of RS-232C/RS-422 control software which has been developed 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 side outputting commands, for example, a computer, is called the controller, while the side receiving the commands, such as an EVI-D70/P, is called the peripheral device. The EVI-D70/P serves as a peripheral device in VISCA. In VISCA, up to seven peripheral devices like the EVI-D70/P can be connected to one controller using communication conforming to the RS-232C/RS-422 standard. The parameters of RS-232C/422 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 devices on the network are assigned addresses. The address of the controller is fixed at 0. The addresses of the peripheral devices are 1, 2, 3 ... in order, starting from the one nearest the controller. The address of the peripheral device is set by sending address commands during the initialization of the network. The VISCA devices each have a VISCA IN and VISCA OUT connector. Set the DTR input (the S output of the controller) of VISCA IN to H when controlling VISCA equipment from the controller. Fig. 1 VISCA network configuration VISCA Controller VISCA Equipment IN OUT IN OUT IN OUT ...1) VISCA is a protocol which controls consumer camcorders developed by Sony. "VISCA" is a trademark of Sony Corporation. 31