B&B Electronics 232CC1A Address Switches Switch Position Bus Connection, Decimal Weight, 7654321

When setting the address (via the dipswitch) use the silkscreen on the printed circuit board. This silkscreen shows a “1” and a “0” -- referring to the “on and “off” states that each switch is set to. Switch S1 configures port one (labeled J1) and, on two port cards, switch S2 configures port two (labeled J2). Least significant bit (LSB) and most significant bit (MSB) are labeled on the card. Table 1 shows the numerical weight and electrical connection of each switch position. Refer to Table 2 for COM Port addresses. Table 3 shows frequently unused port addresses for applications when COM Port addresses 1-4 are already used.

Table 1. Address Switches

Switch Position	7	6	5	4	3	2	1
Bus Connection	SA9	SA8	SA7	SA6	SA5	SA4	SA3
Decimal Weight	512	256	128	64	32	16	8
Hex Weight	200	100	80	40	20	10	8

To install the 232CC card as COM1, 2, 3, or 4, follow the switch settings shown in Table 2. To install at another address, follow the switch settings shown in Table 3.

Table 2. Standard Port Addresses

	Base Hex	Binary	Switch Settings
	Address	Equivalent	MSB LSB
			7654321
COM1	3F8	1111111000	1111111
COM2	2F8	1011111000	1011111
COM3	3E8	1111101000	1111101
COM4	2E8	1011101000	1011101

Documentation Number 232CCxx4502 33

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