3.6 RS232 control
AdderView DVI can be controlled by a remote RS232 device. To select a channel the data rate of the sending device must be set to 1200 baud, 8 bits, no parity and 1 stop bit. No handshaking is used by the AdderView DVI. Simply send the character for the channel which needs to be selected, for example ASCII ‘1’ (hex code 31) will select channel 1, ASCII ‘2’ (hex code 32) will select channel 2 and so on. The AdderView will echo the ASCII character back to the sending device when the channel has been changed. The serial interface pins are found on the options connector on the rear of the AdderView. Pin assignments for this connector are given in appendix A.
3.7 Cascading AdderView DVIs
AdderView DVI switches can be connected together to expand the number of connected computers. When cascading AdderView DVIs a power adapter (AVGPSU) must be connected to each AdderView DVI. AdderView DVIs can be connected in a cascaded tree structure. This can be particularly useful where clusters of computers are located some distance from each other because each unit acts as data booster and can each be up to 5 metres away from the next AdderView DVI. The channel can be selected on remote AdderView DVI units using an extension of the HOTKEY control .
For example, consider a situation where two AdderView DVI units are connected together as shown below. To connect to the computer attached to port 3 on AdderView DVI B the user would hold down the hotkey keys then press ‘2’ followed by ‘3’, whilst keeping the hotkey keys pressed. This will have the effect of connecting to port ‘3’ of the AdderView DVI which is connected into port ‘2’ of the first AdderView DVI unit A.
For example to connect to port 3 on the AdderView DVI cascaded off port 2 of your first AdderView DVI use:
press ba2release 2
press 3release 3ba
AdderView DVI | Installation and Use | Page 26 |
