B&B Electronics 232D4SS8 manual SW2 Weight Chart DIP Switch, Smart Switch/Port Combiner Mode

Table 4. SW2 Weight Chart

DIP Switch 2	Weight
1	1
2	2
3	4
4	8
5	16
6	32
7	64
8	128

For example, if you wish to use the ASCII NAK character as the user defined character, which has a decimal value of 21, you would turn on switches 1, 3, and 5 (1 + 4 + 16 = 21). Caution should be used when selecting the user defined character, so that by itself, or with the ESC character in front of it (4-character command), or with the character following it, it is not a valid command to any of the devices connected to the ports. For instance, on some printers ESC @ is the reset command. If you tried to use the @ symbol (decimal 64) for the user defined character you could reset your printer every time the command control string is sent. Note also, that if your communication configuration is set for 7 data bits you cannot use the eighth position of SW2. For a list of the ASCII character codes and their decimal values refer to Appendix A.

Smart Switch/Port Combiner Mode

This mode allows the CTS lines of ports A - H of the 232D4SS8 to select the Master port. It also allows selection from the Master port via the command control string described in the Smart Switch Mode section. Position 6 of DIP switch 1 (SW1) must be in the ON position to enable this mode. Refer to Figure 2. When all ports are off and the CTS line (pin 5) goes high on any of the eight ports, a connection is established from that port to the Master port. This works on a first-come-first-serve basis and only for RS-232 configured ports. At power up in this mode there is no port selected.

For example, if port A of the 232D4SS8 wanted to established a connection to the Master port, port A would raise its CTS line (pin 5) high. The 232D4SS8 would recognize this as a prompt for connection to the Master port. The connection would be dropped as

16 Documentation Number 232D4SS84502 Manual

B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445