User Guide

Manual Document# 3PXCC4A3001 33
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
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.
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
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
Base Hex
Address
Binary
Equivalent
Switch Settings
MSB LSB
7654321
COM1
3F8 1111111000 1111111
COM2
2F8 1011111000 1011111
COM3
3E8 1111101000 1111101
COM4
2E8 1011101000 1011101