3.6 RS232 control

LINDY CPU Switch Smart 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 LINDY CPU Switch Smart. 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 LINDY CPU Switch Smart 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 LINDY CPU Switch Smart. Pin assignments for this connector are given in appendix A

3.7 Cascading LINDY CPU Switch Smarts

LINDY CPU Switch Smart switches can be connected together to expand the number of connected computers. When cascading LINDY CPU Switch Smarts a power adapter must be connected to each LINDY CPU Switch Smart. LINDY CPU Switch Smarts 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 30 metres away from the next LINDY CPU Switch Smart. The channel can be selected on remote LINDY CPU Switch Smart units using an extension of the HOTKEY control .

For example, consider a situation where two LINDY CPU Switch Smart units are connected together as shown below. To connect to the computer attached to port 3 on LINDY CPU Switch Smart 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 LINDY CPU Switch Smart which is connected into port ‘2’ of the first LINDY CPU Switch Smart unit A.

For example to connect to port 3 on the LINDY CPU Switch Smart cascaded off port

2 of your first LINDY CPU Switch Smart use:

press ED￿release ￿

press ￿release ￿ED

LINDY CPU Switch Smart

Installation and Use

Page 27

Page 34
Image 34
Lindy LF1TBELRG, L1TBELRG, H1TBELRG installation and operation guide RS232 control, Cascading Lindy CPU Switch Smarts