SENA TECHNOLOGIES ZBLINXZU10 Users Manual

ZBlinx-Z series

User Guide

Version 0.0.1

2010-02-01

User Guide for the ZBlinx-Z series

Version 0.0.1
Firmware version 1.0.X
Last revised on January 12, 2010
Printed in Korea

Copyright

Copyright 2002, SENA technologies, Inc. All rights reserved.
SENA Technologies reserves the right to make changes and improvements to its product without
providing notice.

Trademark

ZBlinx™ is a trademark of SENA Technologies, Inc.
Windows® is a registered trademark of Microsoft Corporation.
Ethernet® is a registered trademark of XEROX Corporation.

Notice to Users

When a system failure may cause serious consequences, protecting life and property against such
consequences with a backup system or safety device is essential. The user agrees that protection
against consequences resulting from system failure is the user's responsibility.
This device is not approved for life-support or medical systems.
Changes or modifications to this device not explicitly approved by SENA Technologies will void the
user's authority to operate this device.

Precautions and Safety

Electricity

Use only the supplied AC adapter. Use of unauthorized power adapter is not recommended. Electrical
shock may result.
Do not kink or crease the power cable or place heavy objects on the power cable. Fire can result from
damaged power cables.
Do not handle power plug and adapter with wet hands. Electrical shock may result.
Immediately power off the product and unplug the AC adapter if smoke or odors emit from the product
and adapter. Fire can result from improper use.
Immediately power off the product and unplug the AC adapter if water or other liquids are present. Fire
can result from improper use.

Product

ZBlinx-Z meets the RS-232 standards. Do not wire with non-standard products. Damage to your
products may result from improper use.
Do not drop or subject the device to impact. Damage to your products may result from improper use.
Keep away from harsh environments including humid, dusty, and smoky areas. Damage to your
products may result from improper use.
Do not use excessive force on the buttons or attempt to disassemble the device. Damage to your
products may result from improper use.
Do not place heavy objects on the product. Damage to your products may result from improper use.

Technical Support

SENA Technologies, Inc.
210 Yangjae-dong, Seocho-gu
Seoul 137-130, Korea
Tel: [phone]
Fax: [phone]
E-Mail: [e-mail]
Website: http://www.sena.com

Revision History

Revision Date Name Description

V0.0.1 2010-01-12 Initial Revision History

Contents

1. Introduction......................................................................................................................................6

1.1. Overview........................................................................................................................... 6

1.2. Product Specification........................................................................................................ 7

2. Approval Information........................................................................................................................ 8

2.1. FCC.................................................................................................................................. 8

2.1.1. FCC Compliance Statement..................................................................................... 8

2.1.2. RF Exposure Statement............................................................................................8

2.1.3. Do not ....................................................................................................................... 8

2.2. CE..................................................................................................................................... 8

2.2.1. EC-R&TTE Directive.................................................................................................8

2.3. TELEC.............................................................................................................................. 8

2.4. KCC.................................................................................................................................. 8

3. RF Information.................................................................................................................................9

3.1. Radio Frequency Range .................................................................................................. 9

3.2. Number of Frequency Channel........................................................................................ 9

3.3. Transmission Method....................................................................................................... 9

3.4. Modulation Method...........................................................................................................9

3.5. Radio Output Power.........................................................................................................9

3.6. Receiving Sensitivity ........................................................................................................ 9

4. AT Command................................................................................................................................. 10

4.1. Overview......................................................................................................................... 10

4.2. Command Line Format................................................................................................... 10

4.3. Standard AT Commands..................................................................................................11

4.3.1. AT.............................................................................................................................11

4.3.2. ATA...........................................................................................................................11

4.3.3. ATD<node ID or IEEE address>..............................................................................11

4.3.4. ATE<0 or 1>.............................................................................................................11

4.3.5. ATH..........................................................................................................................11

4.3.6. ATO..........................................................................................................................11

4.3.7. ATS..........................................................................................................................11

4.3.8. ATZ .........................................................................................................................12

4.3.9. AT&F....................................................................................................................... 12

4.3.10. +++.......................................................................................................................... 12

4.4 Extended AT Commands................................................................................................12

4.4.1. AT+EUI ...................................................................................................................12

4.4.2. AT+DESTEUI..........................................................................................................12

4.4.3. AT+NODEID? ......................................................................................................... 12

4.4.4. AT+CH .................................................................................................................... 13

4.4.5. AT+PANID............................................................................................................... 13

4.4.6. AT+EPID................................................................................................................. 13

4.4.7. AT+POWER............................................................................................................13

4.4.8. AT+GROUPID......................................................................................................... 13

4.4.9. AT+DESTGROUPID............................................................................................... 14

4.4.10. AT+INFO.................................................................................................................14

4.4.11. AT+SCAN ............................................................................................................... 14

4.4.12. AT+ASCAN............................................................................................................. 14

4.4.13. AT+ESCAN............................................................................................................. 14

4.4.14. AT+FORM...............................................................................................................14

4.4.15. AT+PERMIT............................................................................................................15

4.4.16. AT+JOIN ................................................................................................................. 15

4.4.17. AT+LEAVE..............................................................................................................15

4.4.18. AT+SLEEP..............................................................................................................15

4.4.19. AT+NODETYPE...................................................................................................... 15

4.4.20. AT+LISTEN.............................................................................................................15

4.4.21. AT+OPMODE ......................................................................................................... 15

4.4.22. AT+DATAMODE...................................................................................................... 15

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4.4.23. AT+UNICAST.......................................................................................................... 15

4.4.24. AT+MULTICAST..................................................................................................... 15

4.4.25. AT+BROADCAST................................................................................................... 15

4.4.26. AT+REMOTECONFIG............................................................................................ 15

4.4.27. AT+TIMEOUT......................................................................................................... 16

4.4.28. AT+PERIOD............................................................................................................ 16

4.4.29. AT+GPIO ................................................................................................................ 16

4.4.30. AT+DIO................................................................................................................... 16

4.4.31. AT+ADC..................................................................................................................17

4.4.32. AT+BAUDRATE...................................................................................................... 17

4.4.33. AT+DATABIT........................................................................................................... 17

4.4.34. AT+PARITY............................................................................................................. 17

4.4.35. AT+STOPBIT.......................................................................................................... 17

4.4.36. AT+FLOWCTRL...................................................................................................... 18

4.4.37. AT+SECURITY....................................................................................................... 18

4.4.38. AT+NWKKEY..........................................................................................................18

4.4.39. AT+SWITCHKEY.................................................................................................... 18

4.4.40. AT+BOOTLOAD ..................................................................................................... 19

4.4.41. AT+HELP................................................................................................................ 19

5. GPIO Configuration ....................................................................................................................... 20

5.1. GPIO Configuration........................................................................................................ 20

5.2. GPIO Setting .................................................................................................................. 20

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1. Introduction

1.1. Overview

ZBlinx Z series are a module device for “wireless personal-area networks," or WPANs using ZigBee
technology that is an IEEE 802.15.4 standard for data communications with business and consumer
devices. ZBlinx Z series combine IEEE 802.15.4, which defines the physical and MAC protocol layers,
with network, security and application software layers as specified by the ZigBee Alliance, a
consortium of technology companies. ZBlinx Z series run in the 2.4-GHz unlicensed frequency band,
and both use small form factors and low power. ZBlinx Z series can communicate with other ZigBee
devices that support the ZigBee2007 Pro stack profile. ZBlinx Z series has a compact design and can
be placed conveniently into devices or equipment. Its detachable antenna optimizes the quality and
distance for wireless communications. ZBlinx Z series lineup has several models with different
communication type as below.

- ZBlinx-ZE10: ZigBee embedded OEM module, long distance

- ZBlinx-ZS10: ZigBee-RS232 adapter, long distance

- ZBlinx-ZU10: ZigBee-USB adapter, long distance

- ZBlinx-ZE10SK: ZigBee embedded OEM module starter kit, ZE10 included.

ZBlinx-Z series support DSSS (Direct Sequence Spread Spectrum), which divides the 2.410 - 2.475
GHz spectrum into 14 channels. ZBlinx-Z series also supports authentication and 128 bit ZigBee AES
encryption algorithms. ZBlinx Z series can be configured and controlled by typical AT commands.
Users can easily configure ZBlinx-Z series by using a terminal program such as HyperTerminal and
can use ZigBee wireless communication without modifying user’s existing serial communication
program. In addition to the basic AT commands, ZBlinx-Z series provides some expanded AT
commands for various functions.

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1.2. Product Specification

Product type
Interface
ZigBee Stack
Frequency range
Channel space
Channel number
TX Power
RX Sensitivity
RF connector

Antenna type

Power
Battery pack
Environmental

ZBlinx-Z series

ZE10 ZS10 ZU10

Embedded module Serial Adapter USB Adapter

2.00mm, pin header 14x2 D-SUB9, Female USB ‘A’, Male
ZigBee 2007 Pro ZigBee 2007 Pro ZigBee 2007 Pro

2.410~2.475GHz 2.410~2.475GHz 2.410~2.475GHz
5MHz 5MHz 5MHz
14ch 14ch 14ch
+13dBm

-100dBm at 1% BER -100dBm at 1% BER -100dBm at 1% BER
RPSMA, COAX, CHIP, WHIP RPSMA RPSMA

Dipole 5.37 dBi Dipole 5.37 dBi Dipole 5.37 dBi
Dipole 3.27 dBi Dipole 3.27 dBi Dipole 3.27 dBi
Dipole 1.40dBi Dipole 1.40dBi Dipole 1.40dBi
Whip ANT 2.1 dBi
Chip ANT 0.5dBi

+3.3V +5~12V +5V USB power
None Lithium polymer +3.7V None

-30 ~ 80

o

C, 95% -30 ~ 80oC, 95% -30 ~ 80oC, 95%

+13dBm +10dBm

Configuration
Dimension
Weight

Approvals
Warranty

AT command set AT command set AT command set
23 x 37 x 11.15mm 68 x 31 x 16mm 68 x 22 x 10mm
10g 24g 12g

FCC, CE,TELEC, KCC FCC, CE,TELEC, KCC FCC, CE,TELEC, KCC

1-year limited warranty 1-year limited warranty 1-year limited warranty

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2. Approval Information

2.1. FCC

2.1.1. FCC Information to User

This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is con­nected.

• Consult the dealer or an experienced radio/TV technician for help.

Caution

Modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.

2.1.2. FCC Compliance Statement

This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions:

(1) This device may not cause harmful interference, and
(2) This device must accept any interference received,

Including interference that may cause undesired operation

2.1.3. RF Exposure Statement

The equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled
environment. This device and its antenna must not be co-located or operation in conjunction with any
other antenna or transmitter.

2.1.4. Do not

Any changes or modifications to the equipment not expressly approved by the party responsible for
compliance could void user’s authority to operate the equipment.

- 8 -

2.2. CE

2.2.1. EC-R&TTE Directive

2.3. TELEC

2.4. KCC

- 9 -

3. RF Information

3.1. Radio Frequency Range

2410~2475MHz

3.2. Number of Frequency Channel

14 channels

3.3. Transmission Method

DSSS (Direct Sequence Spread Spectrum)

3.4. Modulation Method

O-QPSK (Offset Quadrate Phase Shift Keying)

3.5. Radio Output Power

+13dBm

3.6. Receiving Sensitivity

-100dBm

- 10 -

4. AT Command

4.1. Overview

This document contains a description of the AT commands supported in the ZBlinx-Z Series. It also
contains information on how to use the AT commands to create Zigbee a pplications.

4.2. Command Line Format

Each command line sent to ZBlinx-Z Series is composed of a prefix, body and terminator. Only “AT”
can be used for the prefix. The body is a string of characters. The terminator is <CR> or <NL>. A
command can be one of following:

 Read a configuration parameter:

AT<Command>?<CR>

 Do something:

AT<Command><CR>

 Write a configuration parameter:

AT<Command>=<Parameter 1>,<Parameter 2>,<Parameter 3>,…<CR>

Commands denoted with a “+” character are extended AT commands.

S-registers are not supported. Multiple commands in the same com mand line are not supported.

4.3. Standard AT Commands

4.3.1. AT

Description
Response

Check the state of the connection between host and ZBlinx-Z device.
OK<CR>

4.3.2. ATA

Description
Response

Answer incoming call.
CONNECT<CR>

4.3.3. ATD<node ID or IEEE address>

Description
Response

Dial the node ID or IEEE address.
CONNECT<CR>, BUSY<CR>, NO CARRIER<CR> or ER ROR<CR>

4.3.4. ATE<0 or 1>

Description
Response

Echo or No Echo.
OK<CR>

4.3.5. ATH

Description
Response

Hang up the current call.
NO CARRIER<CR>

4.3.6. ATO

Description

Return to data mode.

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Response

4.3.7. ATS<0 or 40>

Description

Example

Get/Set the S-registers.
(S0: number of rings before auto-answer (under 10),
S40: determine thruput (This is the same with the value of data transport mode))
ATS0=3<CR>
OK<CR>

ATS40?<CR>
1<CR>
OK<CR>

4.3.8. ATZ

Description
Response

Reset the node. (initialize current network status)
OK<CR>

4.3.9. AT&F

Description
Response

Factory reset. (initialize cookies)
OK<CR>

4.3.10. +++

Description
Response

Interrupt data mode.
OK<CR>

4.4. Extended AT Commands

4.4.1. AT+EUI?

Description
Response

Get the 64-bit EUI address. (IEEE address, long address)
000D6F0000488434<CR>
OK<CR>

4.4.2. AT+DESTEUI

Description

Example

Get/Set the 64-bit destination EUI address for data transmission. (pairing, point-to­point and send GPIO values)
AT+DESTEUI=000D6F000048842F<CR>
OK<CR>

AT+DESTEUI?<CR>
000D6F000048842F<CR>
OK<CR>

4.4.3. AT+NODEID?

Description

Get the 16-bit node ID. (network address, short address) The only coordinator has a
fixed value (0x0000) and other device types are assigned at random.

- 12 -

Response

1E9C<CR>
OK<CR>

4.4.4. AT+CH

Description

Example

Get/Set the channel mask to use. Bits set as 1 indicate that this particular channel can
be used. Bits set as 0 indicate that this particular channel should not be used. For
example, a channel mask value of 0x00000001 indicates that only channel 0 should be
used. Valid channels range from 11 to 26 inclusive. This translates to a channel mask
value of 0x07FFF800.
AT+CH=7FFF800<CR>
OK<CR>

AT+CH?<CR>
07FFF800<CR>
OK<CR>

4.4.5. AT+PANID

Description
Example

Get/Set the 16-bit PAN ID.
A T+PANID=ABCD<CR>
OK<CR>

AT+PANID?<CR>
ABCD<CR>
OK<CR>

4.4.6. AT+EPID

Description
Example

Get/Set the 64-bit extended PAN ID.
AT+EPID=0123456789ABCDEF<CR>
OK<CR>

AT+EPID?<CR>
0123456789ABCDEF<CR>
OK<CR>

4.4.7. AT+POWER

Description
Example

Get/Set the TX power. (-43~3)
AT+POWER=3<CR>
OK<CR>

A T+POWER?<CR>
3<CR>
OK<CR>

4.4.8. AT+GROUPID

Description

Get/Set the 16-bit Group ID.

- 13 -

Example

AT+GROUPID=ABCD<CR>
OK<CR>

AT+GROUPID?<CR>
ABCD<CR>
OK<CR>

4.4.9. AT+DESTGROUPID

Description
Example

Get/Set the 16-bit destination Group ID for data transmission. (group network)
AT+DESTGROUPID=ABCD<CR>
OK<CR>

AT+DESTGROUPID?<CR>
ABCD<CR>
OK<CR>

4.4.10. AT+INFO

Description
Response

Show the current information of this node.

Information of this node
…

OK<CR>

4.4.11. AT+SCAN

Description
Response

Perform a scanning for joinable network.

List of the joinable networks

…
OK<CR>

4.4.12. AT+ASCAN

Description
Response

Perform a scanning for existing network.

List of the existing networks

…
OK<CR>

4.4.13. AT+ESCAN

Description
Response

Perform a scanning for energy level of each channel.

List of the RSSI for each channel

…
OK<CR>

4.4.14. AT+FORM

Description

Form a network. If there’s no specified channel mask or PAN ID, it does an energy
scan on the indicated channel mask and randomly chooses one from amongst those
with the least average energy. Then picks a short PAN id that does not appear during
an active scan on the chosen channel. At this time extended PAN ID is alternated for

- 14 -

EUI address if it isn’t designated before.

Response

OK<CR>

4.4.15. AT+PERMIT

Description
Response

Permit other nodes to join the network. (0~254s, 255=continuance)
OK<CR>

4.4.16. AT+JOIN

Description
Response

Join a network using the specified network parameters.
OK<CR>

4.4.17. AT+LEAVE

Description
Response

Leave the current network.
OK<CR>

4.4.18. AT+SLEEP

Description

Response

Sleep mode only for end-device. (0: none-sleep, 1: sleep and wake up periodically and
possible to transmit data, 2: similar to mode 1 but can deep-sleep if there’s no data
transmission quite a while, 3: deep-sleep)

Information of this node
…

OK<CR>

4.4.19. AT+NODETYPE

Description

Example

Get/Set the node type. (0: none, 1: coordinator, 2: router, 3: end-device) It’s applied
after resetting the node.
AT+NODETYPE=1<CR>
OK<CR>

AT+NODETYPE?<CR>
1<CR>
OK<CR>

4.4.20. AT+LISTEN

Description

Example

Get/Set the listen mode to receive a message or GPIO value from the network. It is
presented by a form of “+(or ++ when GPIO)EUI address of sender|message”.
AT+LISTEN=1<CR>
OK<CR>

AT+LISTEN?<CR>
1<CR>
OK<CR>

4.4.21. AT+OPMODE

Description

Get/Set the operation mode. (0: none, 1: pairing, 2: unicast, 3: multicast, 4:

- 15 -

broadcast) It’s applied after resetting the node.

Example

AT+OPMODE=1<CR>
OK<CR>

AT+OPMODE=?<CR>
1<CR>
OK<CR>

4.4.22. AT+DATAMODE

Description

Example

Get/Set the data transport mode. (0: no data loss, 1~3: optimized for thruput, 4:
maximized thruput)
AT+DATAMODE=1<CR>
OK<CR>

AT+DATAMODE?<CR>
1<CR>
OK<CR>

4.4.23. AT+UNICAST

Description
Example

Send unicast message to specific node using EUI address or node ID.
AT+UNICAST=000D6F000048842F,send_unicast_MSG<CR>
OK<CR>

4.4.24. AT+MULTICAST

Description

Example

Send multicast message to specific group. Every node belongs to a group after being
booted up if it is designated a group ID. (default: 0x0000)
AT+MULTICAST=ABCD,send_multicast_MSG<CR>
OK<CR>

4.4.25. AT+BROADCAST

Description
Example

Send broadcast message to the all nodes joining the network.
AT+BROADCAST=send_broadcast_MSG<CR>
OK<CR>

4.4.26. AT+REMOTECONFIG

Description

Example

Remote control the configuration of specific node by sending unicast command
message. It is possible to get or set the configuration status of the node joined current
network.
A T+REMOTECONFIG<CR>

Possible command list
…

OK<CR>

AT+REMOTECONFIG=000D6F000048842F,AT command<CR>
OK<CR>

- 16 -

4.4.27. AT+TIMEOUT

Description
Example

Get/Set the time out for data transmission. (ms)
AT+TIMEOUT=100<CR>
OK<CR>

AT+TIMEOUT?<CR>
100<CR>
OK<CR>

4.4.28. AT+PERIOD

Description

Example

Get/Set the period to send GPIO values. (250*t ms) Every node sends GPIO values to
the destination EUI address periodically and it can be read listen mode.
AT+PERIOD=10<CR>
OK<CR>

AT+PERIOD?<CR>
10<CR>
OK<CR>

4.4.29. AT+GPIO

Description

Example

Get/Set the configuration status of GPIO individually or all at once. It’s applied after
resetting the node.
AT+GPIO0=1<CR>
OK<CR>

AT+GPIO?<CR>
11000440002200 <CR>
OK<CR>

4.4.30. AT+DIO

Description

Example

Get/Set the digital IO value individually or all at once. All GPIO pins can be used as
digital IO and it is only possible to set 0 or 1. If there are some pins used analog input,
they are displayed by “*”.
AT+DIO0=1<CR>
OK<CR>

AT+DIO?<CR>
00011**0101111 <CR>
OK<CR>

4.4.31. AT+ADC

Description

Response

Get the analog input value individually or all at once. GPIO3~6 are possible to set ADC
and it’s read only.

The analog input value of the ADC

- 17 -

OK<CR>

4.4.32. AT+BAUD

Description
Example

Get/Set the serial port speed.
AT+BAUD=115200<CR>
OK<CR>

AT+BAUD?<CR>
115200<CR>
OK<CR>

4.4.33. AT+DATABIT

Description
Example

Get/Set the data bit of serial port.
AT+DATABIT=8<CR>
OK<CR>

AT+DATABIT?<CR>
8<CR>
OK<CR>

4.4.34. AT+PARITY

Description
Example

Get/Set the parity of serial port.
AT+DATABIT=8<CR>
OK<CR>

AT+DATABIT?<CR>
8<CR>
OK<CR>

4.4.35. AT+STOPBIT

Description
Example

Get/Set the stop bit of serial port.
A T+ST OPBIT=1<CR>
OK<CR>

AT+STOPBIT?<CR>
1<CR>
OK<CR>

4.4.36. AT+FLOWCTRL

Description
Example

Get/Set flow control status. (0: none, 1: software, 2: hardware flow control)
A T+FLOWCTRL=0<CR>
OK<CR>

AT+FLOWCTRL?<CR>
0<CR>

- 18 -

OK<CR>

4.4.37. AT+SECURITY

Description

Example

Get/Set the security status. (0: turning security off, 5: on) Every node must be under
the same security level in the network and it’s applied after resettin g the node.
AT+SECURITY=5<CR>
OK<CR>

AT+SECURITY?<CR>
5<CR>
OK<CR>

4.4.38. AT+NWKKEY

Description

Example

Get/Set the 128-bit encryption key. (possible to set only for coordinator, 0: generate
random 128-bit number)
AT+NWKKEY=0123456789ABCDEF0123456789ABCDEF<CR>
OK<CR>

AT+NWKKEY?<CR>
0123456789ABCDEF0123456789ABCDEF <CR>
OK<CR>

4.4.39. AT+SWITCHKEY

Description
Response

Switch the encryption key for current network only for coordinator.
OK<CR>

4.4.40. AT+BOOTLOAD

Description
Response

Start bootloader to perform firmware upgrade.
EM250 Bootloader v20 b09

1. upload ebl

2. run

3. ebl info
BL >

4.4.41. AT+HELP

Description
Response

Show all the available commands

Available A T Commands

…
OK<CR>

- 19 -

5. GPIO Configuration

5.1. GPIO Configuration

Module Configuration
GPIO Pin number Configured GPIO Specific functionality ADC enable
0 4 - Factory reset (SW0) X
1 6 0 ZC or ZR: Permit joining

ZED: Wake-up (SW1)
2 5 1 ZB status: ZC/ZR/ZED (LED0) X
3 3 2 ZB status: data transmission (LED1) X
4 11 3 O (ADC0)
5 10 4 O (ADC1)
6 8 5 Set baud rate 1 (DIPSW0) O (ADC2)
7 7 6 Set baud rate 2 (DIPSW1) O (ADC3)
8 ? (unconnected) 7 Set baud rate 3 (DIPSW2) X
9 22 - UART_TXD (LED2) X
10 23 - UART_RXD (LED2) X
11 21 8 UART_CTS X
12 20 9 UART_RTS X
13 24 10 UART_DTR X
14 25 11 UART_DSR X
15 26 12 X
16 19 13 Set baud rate 4 (DIPSW3) X

5.2. GPIO Setting

X

0 disabled (unm onitored digital input)
1 Digital input, monitored
2 Digital output, default low
3 Digit al output, default high
4 Analog input, single ended (A/D pins only)
5 Reserved for pin-specific alternate functionalities

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