B&B Electronics 3PXCC4A Standard Port Addresses, Base Hex Address, Binary Equivalent, 7654321

When setting the address (via the dipswitch) use the silkscreen on the printed circuit board. This silkscreen shows a “1” and a “0” to refer 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.

Switch Position

Bus Connection

Decimal Weight

Hex Weight

Table 1. Address Switches
7	6	5	4	3	2	1
SA9	SA8	SA7	SA6	SA5	SA4	SA3
512	256	128	64	32	16	8
200	100	80	40	20	10	8

To install the 3PXCC4A 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

COM1

COM2

COM3

COM4

Base Hex

Address

3F8

2F8

3E8

2E8

Binary

Equivalent

1111111000

1011111000

1111101000

1011101000

Switch Settings

MSB LSB

7654321

1111111

1011111

1111101

1011101

Manual Document# 3PXCC4A3001 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