B&B Electronics 3PXCC1A User manual

Documentation No. 3PXCC1x-2x-3903 Cover Page
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]
This manual covers the following B&B Electronics' model serial
cards:
RS-232/422/485 Serial Cards CE
3PXCC1a 3PXCC1b
3PXCC2a 3PXCC2b
Documentation Number 3PXCC1x-2x-3903
Each of these models is an RS-232 serial card and uses the same printed circuit
board. The "1" and "2" suffix designates the number of ports on the card. The model
number of the card is printed on a sticker on the board.
This product designed and manufactured in Ottawa, Illinois USA
of domestic and imported parts by
International Headquarters
B&B Electronics Mfg. Co. Inc.
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA
Phone [phone] -- General Fax [phone]
Home Page: www.bb-elec.com
Sales e-mail: [email protected] -- Fax [phone]
Technical Support e-mail: [email protected] -- Fax [phone]
European Headquarters
B&B Electronics Ltd.
Westlink Commercial Park, Oranmore, Co. Galway, Ireland
Phone [phone] -- Fax [phone]
Home Page: www.bb-europe.com
Sales e-mail: [email protected]
Technical Support e-mail: [email protected]
B&B Electronics -- Revised October 2003

Documentation No. 3PXCC1x-2x-3903 Table of Contents i
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]
Table of Contents
Chapter 1: Introduction and General Information........... 1
Features ................................................................................ 1
Specifications ........................................................................ 1
Chapter 2: Quick Installation Guide ................................. 3
Chapter 3: Windows Installation ...................................... 5
Checking Device Manager for Available Address/IRQ’s
(Windows 95/98) ................................................................... 5
Adding Serial Port(s) in Windows 95/98 ......................... 8
Changing COM Port Resources in Windows 95/98 ..... 12
Checking Windows NT Diagnostics for Available
Address/IRQ’s (Windows NT 4.0) ....................................... 15
Checking Windows 2000 for Available Address/IRQ’s ....... 18
Adding Serial Port(s) in Windows 2000 ........................ 22
Chapter 4: Address and IRQ Setting.............................. 29
Address Switch Setup ......................................................... 29
Interrupt Jumper Setup........................................................ 32
Chapter 5: Communication Jumper Settings................ 35
RS-232 Mode ...................................................................... 35
RS-422 Mode ...................................................................... 36
RS-485 Mode ...................................................................... 36
RS-485 Pinouts............................................................. 37
RS-485 Operation......................................................... 37
RS-422 and RS-485 Termination........................................ 38
High Speed Mode................................................................ 38
Chapter 6: Physical Hook-up and Troubleshooting ..... 39
Pinouts................................................................................. 39
RS-232 Pinouts............................................................. 39
RS-422 Pinouts............................................................. 39
RS-485 Pinouts............................................................. 40
Communication Cable Data ................................................ 41
Troubleshooting................................................................... 42
Appendix A: Hardware I/O Map .................................... A-1
Appendix B: Declaration of Conformity Statement .... B-1
ii Table of Contents Documentation No.3PXCC1x-2x-3903
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]

Documentation No.3PXCC1x-2x-3903 1
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]
Chapter 1: Introduction and General Information
The B&B Electronics’ 3PXCC series serial interface cards are
designed for the IBM PC, XT, AT and compatibles. Ports are
configured as a standard DTE device, and connections are made on
9-pin D-style connectors.
The 3PXCC cards offer exceptional setup flexibility. The 3PXCC
series has the ability to use any I/O address and any hardware
interrupt. You can install as many serial ports as will physically fit in
a machine. To use one of the “non-standard” addresses or
interrupts, the serial software used must also offer that flexibility. If
you are writing your own application, be sure the communications
routines used support any address and IRQ. B&B Electronics’
SimpCom Communications Drivers support these features.
Features
•Switch selectable addresses, from 0 to hex 3F8, including
COM1 – COM4
•Jumper selectable interrupts: 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, 15
•Enhanced 16 bit Address Decoding
•Baud rates up to 230.4K baud with 2X clock option enabled
•16550A UARTs on all ports
•Supports all standard RS-232 lines: TD, RD, RTS, CTS, DSR,
DCD, DTR, and RI
Specifications
Bus: IBM PC ISA Bus
Slot: Requires 1 full length slot for complete IRQ selectability. When
installed in a short slot, IRQ’s 10-15 will not be available.
Dimensions: 6.3 x 3.3 in (16.0 X 8.4cm)
I/O connection: 9-pin male, D-sub connectors
Baud rates: 230,400 baud max with 2x clock jumper enabled
Character length: 5, 6, 7, or 8 bits
Parity: Even, odd or none
Stop bits: 1, 1.5, or 2
Interrupt: IRQ 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, or 15
Address: Switch programmable, 0 to hex 3F8
2 Documentation No.3PXCC1x-2x-3903
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RS-232 Drivers:
Device: SN75185
Transmitter output voltage: ±10.0 V minimum
Short circuit current: ±12 mA typical
Input low level threshold voltage: 0.65 V minimum
Input high level threshold voltage: 2.5V maximum
Device will withstand ±30 V
RS-422/485 Driver/Receiver:
Device: MAX491 or equivalent
Differential driver output voltage: 1.5 - 6 V
Differential input high-threshold voltage: 0.2 V maximum
Differential input low-threshold voltage: -0.2 V minimum
Automatic RS-485 Driver Control Timing:
Driver is enabled when data is a logic “0” (start bit). Driver
remains enabled for one character transmission time (10 bits
of
data at current baud rate). Each additional logic “0” resets
the timeout.
Power Consumption (2-port model):
+5V, 180mA, 900mW
+12V, 50mA, 600mW
-12V, 65mA, 780mW
Total maximum power draw: 2.28 W

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Chapter 2: Quick Installation Guide
The following steps will help you install the Model 3PXCC Serial
Card. Please follow (step-by-step) the following numbered
instructions and refer to any corresponding chapters for more
details.
Before removing the card from the anti-static protective packaging.
•Discharge any static electricity buildup on your body by touching
a large grounded metal surface or the metal chassis on
equipment connected to earth ground by a 3-wire power cord.
•Avoid touching the gold connectors or other parts on the card
except as necessary. After setting the jumper, ground yourself
to the computer chassis before and while inserting the card.
•Remove AC power from the computer and unplug the power
cord before inserting the card.
•Retain the ESD bag for handling the card. Save the packaging
for storage or shipping.
1. Make sure you have an available ISA slot for installing your B&B
Electronics Serial Card. You may have to remove the cover of
your PC.
2. Determine what addresses and IRQ’s are free to use on your
PC by checking your operating system for unused addresses
and IRQ’s. Each port uses eight I/O address spaces starting at
the base address that you select. Each port I/O address and
interrupt request (IRQ) must be set as well. See “Checking
Device Manager for Available Address/IRQ’s” in Chapter 3 for
your operating system. Refer to Chapter 4 (Table 3) for
frequently unused I/O Addresses and IRQ’s. Write down the
address and IRQ you select to use. Do not physically install the
ISA card at this point.
3. Add New Hardware – This consists of adding a port or ports to
your operating system. See “Adding Serial Ports” in Chapter 3
for specific instructions for your operating system.
CAUTION: Electrostatic Sensitive Device.
Use ESD precautions for safe handling.
4 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
4. Assign Address and IRQ – The address and IRQ are set in the
operating system that you are using. This is the final step of
adding new hardware. See Chapter 4 for more details.
5. Set up the address (with dipswitches) and IRQ (jumpers) on the
serial card to reflect unused addresses and IRQ’s that you want
to use. The address dipswitch setting consists of configuring
seven dipswitches that reflect a particular hex address. The IRQ
is set via a little black jumper. See Chapter 4 for an explanation
of address and IRQ settings as well as details on configuring the
card itself.
6. Set serial card hardware jumpers for the communication
parameters that you desire. See Chapter 5 for an explanation of
serial parameters and details on how to configure them.
7. Shut down the PC before installing the serial card.
8. Install ISA serial card into an available ISA slot in the PC.
9. Physical Hook-up and Troubleshooting – pinout, cable data, and
troubleshooting information. See Chapter 6 for more details.

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Chapter 3: Windows Installation
Checking Device Manager for Available
Address/IRQ’s (Windows 95/98)
Click on Start / Settings / Control Panel and double-click on System
Properties.
Left-click on Device Manager.
Double-click on Computer.
6 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Left-click on Interrupt Request.
Find a free IRQ in the displayed list. Any number that is seen on
the left hand side of this screen is an IRQ that is currently being
used. The object is to find a number of IRQ(s) that are not listed and
set your port(s) using those IRQ’s.

Documentation No.3PXCC1x-2x-3903 7
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Left-click on Input/Output (I/O).
Scroll through the list, checking 03F8H, 02F8H, 03E8H, 02E8H. If
one of these is available, use it. If not, check alternates.
Find a free address in the list. Most desktop PC’s have a COM1 and
possibly a COM2 already on their system which will be seen in the
list. You might have to start at COM3 or COM4 to begin addressing
the ISA card. If these addresses are used you may have to resort to
the Frequently Unused Port Addresses (found in Chapter 4, Table 3)
of this manual. Write these open addresses and IRQ’s down for later
reference.
8 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Adding Serial Port(s) in Windows 95/98
Go to Start Menu / Settings / Control Panel.
Run the Windows Add New Hardware utility found in the control
panel. Click Next.

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Click Next.
Select Yes/No for the device in the list. Click Next.
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Select No (you do not want Windows to search for your new
hardware). Click Next.
Select Ports (COM & LPT). Click Next.

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Select (Standard port types) and Communication Port. Click Next.
The next screen will show the address and interrupt request of
the port. These may not match your configuration. For now, simply
click Next. Windows may ask for the Windows 95/98 disk/CD to be
inserted.
Finally, click Finish.
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Changing COM Port Resources in Windows 95/98
Click Start / Settings / Control Panel and double-click on System
Properties.
Click on Device Manager (make sure “View devices by type” is
enabled.
Double-click on Ports (COM & LPT).
Double-click on the new port that has been added.

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Click Resources.
14 Documentation No.3PXCC1x-2x-3903
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Click off (check mark out of box) Use automatic settings.
Select Basic Configuration 0007 (or last one).
Select Input / Output Range.
Click Change Setting.
Change Address to match the free address settings you found
earlier.
Click OK.
Select Interrupt Request.
Click Change Settings.
Change IRQ to match the free IRQ settings you found earlier.
At this point you can shut down the system and physically install
your B&B Electronics Serial Card into an available ISA Slot. Double
check to make sure the addresses and IRQ’s on the Serial Card are
set to the correct settings.

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Checking Windows NT Diagnostics for Available
Address/IRQ’s (Windows NT 4.0)
Click on Start / Programs / Administrative Tools / Windows NT
Diagnostics.
Left-click on Resources.
Find a free IRQ in the following list. Any number that is seen on
the left hand side of this screen is an IRQ that is currently being
used. The object is to find a number of IRQ(s) not listed and set
your port(s) using those IRQ’s.
16 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Left-click on I/O Port in Resources. Tab to view currently used
addresses.
Scroll through the list, checking 03F8H, 02F8H, 03E8H, 02E8H. If
one of these is available, use it. If not, check alternates.
Find a free address in the list. Most desktop PC’s have a COM1
and possibly a COM2 already on their system, which will be seen in
the list. You may have to start at COM3 or COM4 to start your
addressing of the ISA card you have. If these addresses are used
you may have to resort to the Frequently Unused Port Addresses
(found in Chapter 4, Table 3) of this manual. Write these open
addresses and IRQ’s down for later reference.

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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Adding Serial Port(s) in Windows NT 4.0
Go to Start Menu / Settings / Control Panel.
Double-click on Ports.
Click Add.
Choose COM Port Number, Base I/O Address, and IRQ that you
want to use for the new Serial Port(s) being added.
After clicking OK, you will see a screen – System Setting
Change. Click the button Restart Now to restart Windows NT 4.0.
At this point you can shut down the system and physically install
your B&B Electronics Serial Card into an available ISA slot. Double
check to make sure the addresses and IRQ’s on the Serial Card are
set to the correct settings.
18 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Checking Windows 2000 for Available Address/IRQ’s
Click on Start / Settings / Control Panel.
Double-click on System.
Click on Hardware.

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Click on Device Manager.
20 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Click on View (top of screen).
Click on Resources by type.
Double-click on Input/Output. Find an unused address to set your
B&B Electronics serial card to.
Scroll through the list, checking 03F8H, 02F8H, 03E8H, 02E8H. If
one of these is available, use it. If not, check alternates.
Find a free address in the list. Most desktop PC’s have a COM1
and possibly a COM2 already on their system, which will be seen in
the list. You may have to start at COM3 or COM4 to start your
addressing of the ISA card you have. If these addresses are used
you may have to resort to the Frequently Unused Port Addresses
(found in Chapter 4, Table 3) of this manual. Write these open
addresses and IRQ’s down for later reference.

Documentation No.3PXCC1x-2x-3903 21
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]
Double-click on Interrupt Request (IRQ). Here you need to find an
unused IRQ to set your B&B Electronics serial card to.
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Adding Serial Port(s) in Windows 2000
Go to Start Menu / Settings / Control Panel.
Double-click on Add/Remove Hardware.

Documentation No.3PXCC1x-2x-3903 23
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Click Next.
Click on Add/Troubleshoot a device.
Click Next.
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The following screen will appear after a few seconds.
Click Add a new device.
Click Next.

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Click No, I want to select the hardware from a list.
Click Ports (COM & LPT).
Click Next.
26 Documentation No.3PXCC1x-2x-3903
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Select Standard port types and Communication Ports and Click
Next. You will see the following screen, go ahead and Click OK.
The Resources area will allow you to set the IRQ and address of
your new ports.
Click on the down arrow to the middle right of the screen after
“Setting based on”:

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Click on the highest Basic configuration number in the list on the
“Setting based on” category.
Double-click on the Input/Output Range to set the Address.
Double-click on the Interrupt Request to set the IRQ.
Select IRQ and Address that you want your port(s) configured at.
28 Documentation No.3PXCC1x-2x-3903
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B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
At this point you can shut down the system and physically install
your B&B Electronics Serial Card into an available ISA slot. Double
check to make sure the addresses and IRQ’s on the Serial Card are
set to the correct settings.

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Chapter 4: Address and IRQ Setting
Address Switch Setup
A Windows PC has I/O port addresses and memory addresses.
Some devices use both types of addresses. I/O port addresses have
a 64K address space. Devices may decode all 16 address bits or
only some of the lower bits. Traditionally, serial cards have only
decoded 10 bits of the address bus. Recently this has begun to
cause address conflicts with full 16 bit decoded devices, most
notably between video cards and COM 4. B&B has solved these
conflicts by decoding all 16 bits of the ISA address bus. Address
settings in our ISA bus serial cards is set by DIP switches (selecting
bits 11-4) or jumpers.
B&B Electronics 3PXCC cards are factory configured for COM1
IRQ4, and COM2 IRQ3 (2-port models). If you plan on installing the
3PXCC as standard COM1 and COM2, you may leave the address
and IRQ set to the factory defaults.
The 3PXCC cards use a 7-position DIP switch to program the
binary I/O address of each port on the card. Figure 1 is a drawing of
the printed circuit board that shows the locations of the setup
switches and jumpers on the 3PXCC cards.
CAUTION: Electrostatic Sensitive Device.
Use ESD precautions for safe handling.
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Figure 1. Silk Screen Plot of 3PXCC PCB

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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 3PXCC 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
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Table 3. Frequently Unused Port Addresses
Interrupt Jumper Setup
The IRQ is a hardware Interrupt Request line in an ISA Bus
expansion slot on a PC or AT compatible computer. The 8 bit PC
ISA slot has 8 interrupts, the 16 bit slot has another 7 since one of
the first 8 is used to link in the remaining 8. The IRQ is used by
devices to request immediate service by the main microprocessor.
When the IRQ line is set, the microprocessor stops whatever it’s
doing, saves status, checks which line was set, then jumps to code
to handle the interrupt. The processor then clears the interrupt and
returns to what it was doing before. IRQ lines are set by the internal
timer, keyboard, hard drive controller, PCI, USB controller, sound
card, serial ports, printer and more. The 3PXCC2 serial cards
include special circuitry which allows one IRQ to be shared between
the cards two ports even during simultaneous use. The software
driver must support shared IRQs for this feature to work. Both
Windows 9x and NT support shared IRQs. To configure both ports
of the card to share one IRQ, set both jumpers of JP4 to the “Share”
position. The Port 1 IRQ Select jumper should then be set to the
desired IRQ. The Port 2 IRQ Select jumper is ignored when in
shared mode.
The 3PXCC cards allow the use of interrupts (IRQ) 2, 3, 4, 5, 6,
7, 10, 11, 12, 14, and 15. Table 4 shows the standard serial port IRQ
settings. NOTE: If two ports use the same IRQ setting, both ports
cannot use the serial port at once. Only one port at a time may
communicate.
Base
Hex
Address
Binary
Equivalent
Switch
Settings
MSB LSB
7654321
I/O Space
Description
200 1000000000 1000000 game port
208 1000001000 1000001 game port
300 1100000000 1100000 prototype
308 1100001000 1100001 prototype
310 1100010000 1100010 prototype
318 1100011000 1100011 prototype
380 1110000000 1110000 SDLC
388 1110001000 1110001 SDLC
3A0 1110100000 1110100 bisync com
3A8 1110101000 1110101 bisync com

Documentation No.3PXCC1x-2x-3903 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]
Table 4. Standard IRQ Settings
COM1 IRQ4
COM2 IRQ3
COM3 IRQ4
COM4 IRQ3
34 Documentation No.3PXCC1x-2x-3903
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]

Documentation No.3PXCC1x-2x-3903 35
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]
Chapter 5: Communication Jumper Settings
This chapter will cover all of the jumper settings to set your B&B
Serial Card for the proper communications that you desire.
RS-232 Mode
To configure a port for RS-232 mode, 5 jumpers must be
checked. The following settings will configure Port 1 as RS-232.
1. JP1A - must be set in the "232" (left) position.
2. JP1F - all four jumpers must be set in the "232" (left) position.
Jumpers JP1B - JP1E have no meaning in RS-232 mode
and may be in either position. Figure 2 shows the jumper
configuration to set both ports for RS-232 mode.
Figure 2. RS-232 Mode Jumper Settings
CAUTION: Electrostatic Sensitive Device.
Use ESD precautions for safe handling.
36 Documentation No.3PXCC1x-2x-3903
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]
RS-422 Mode
To configure a port for RS-422 mode, 7 jumpers must be
checked. The following settings configure Port 1 as RS-422.
1. JP1A, JP1B, JP1C - must be set in the "422" (right) position.
2. JP1F - all four jumpers must be in the "422" (right) position.
Figure 3 shows the jumper configuration to set both ports for
RS-422 mode.
Figure 3. RS-422 Mode Jumper Settings
Note that the EIA RS-422 Specification labels data lines with
an "A" and "B" designator. Some RS-422 equipment uses a "+" and
"-" designator. In almost all cases, the "A" line is the equivalent of
the "-" line and the "B" line is the equivalent of the "+" line. More
information on RS-422 communications can be found in B&B
Electronics’ free RS-422/RS-485 Application Note.
RS-485 Mode
To configure a port for RS-485 mode, 9 jumpers must be
checked. The following settings configure Port 1 as RS-485.
1. JP1A - must be set in the "422" (right) position.
2. JP1B, JP1C - must be set in the "485" (left) position.
3. JP1D, JP1E - set to match software and installation
requirements.
4. JP1F - all four jumpers must be in the "422" (right) position.