BARIX X8 User manual

BARIX X8
I/O to RS-485 Modbus converter
for commercial interfacing,
control and home automation
applications
PRODUCT MANUAL
Version: 01.05
Date: 10/26/2006
For Firmware Version 6
BARIX X8
Barix AG
Seefeldstrasse 303
CH-8008 Zürich
Switzerland
T [phone]
F [phone]
Barix Technology Inc.
2182 Helena Road
St. Paul, MN 55128
USA
T [phone]
F [phone]
www. barix.com
[e-mail]

Table of Contents
Introduction.................................................................1
Hardware.......................................................................2
Case....................................................................................................2
Connectors......................................................................................2
Power supply requirements......................................................2
Inputs..................................................................................................2
Outputs.............................................................................................2
5VDC output...................................................................................3
RS-485................................................................................................3
LED Indicators................................................................................3
Configuration Memory................................................................3
Connectors....................................................................4
Connector Pin out overview...................................................4
J1 Pin out I/O..................................................................................4
J3 Pin out Power/RS-485...........................................................5
J4 Pin out GND/Shield Jumper................................................5
J5 Pin out Shield............................................................................6
LED 1..4 Functions.......................................................................6
Protocol support........................................................7
General..............................................................................................7
Supported Standard Commands.............................................7
Special Commands........................................................................7
Exceptions........................................................................................8
Command 68...................................................................................8
Command 69...................................................................................9
Command 70...................................................................................9
Command 71................................................................................10

Configuration.............................................................11
Default Parameters....................................................................11
Connecting I/O..........................................................12
Contacts on inputs....................................................................12
LEDs on outputs.........................................................................12
TTL devices on I/O....................................................................13
WIEGAND device......................................................................13
Barix TS Temperature Sensors............................................15
Connecting a Barix Barionet controller........16
Power wiring................................................................................16
RS-485 wiring...............................................................................16
Reference wire............................................................................16
RS-485 termination....................................................................16
Modbus Register Map.............................................17
Live I/O...........................................................................................17
Configuration Data....................................................................18
Complete Register Map...........................................................20
Complete Coils Map..................................................................21
Technical specifications........................................23
CPU..................................................................................................23
I/Os...................................................................................................23
5VDC output................................................................................23
I/O, RS-485/Power, shield Connectors.............................23
Host Interface..............................................................................23
Power Supply Requirements..................................................23
LED Indicators.............................................................................23
Case..................................................................................................23
Misc..................................................................................................23
Conformity....................................................................................23

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Introduction
The BARIX X8 is an I/O to RS-485 Modbus converter for com-
mercial interfacing, control and home automation applications.
Using the industry standard Modbus protocol over 2-wire RS-485
the device can be controlled from any Modbus capable master.
Eight independent configurable inputs/outputs allow the use of
the BARIX X8 in a wide range of I/O applications:
- General I/O to RS-485 converter (inputs and outputs)
- Up to eight push buttons (inputs) or LEDs for status display
- Local analog voltage reading (0-5VDC, 8 inputs)
- Local temperature (up to 8 Barix TS digital sensors)
- WIEGAND reader to RS-485 converter (2 inputs for D0 and
D1, other 6 I/Os usable with standard functions)
The device is configured via the serial interface using standard
Modbus read/writes. If the device ID is unknown, a special
command is available, which can be sent via broadcast and uses
the serial number of the device to send it new configuration info.
If the address of the device is not known, it can be reset to default
parameters (see chapter Configuration).
The protocol supported is Modbus/RTU at 19200 (default) and
9600 Baud, with even (default) or no parity.
Introduction · 1

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Hardware
The BARIX X8 I/O to RS-485 Modbus converter comes in an
open plastic case.Two mounting brackets with 5mm holes allow
mounting on surfaces but can be cut off (predetermined cut line)
if not used.
The Power/RS-485, I/O (I/O, 5Vout,GND) and cable shield are
available on 3 spring contact connector blocks for wires
AWG28 - AWG16 / 0.08 - 1.3 mm2
The BARIX X8 is equipped with a universal power input and
accepts both AC and DC voltage.The AC supply range is12 to 24
Volts and 9 to 30 Volts when powered by a DC power supply.
A voltage regulator controls the internally needed operating
voltage of 5VDC.The BARIX X8 consumes with all outputs
activated 1 Watt max. The BARIX X8 is reverse polarity
protected.
Attention:When powering the BARIX X8 and other BARIX
devices (Barionet, IO12, R6), connected over RS-485, using a single
power supply only a DC type power supply can be used as the
RS-485 interfaces are not completely potential free.
All I/O pins are directly connected to the CPU and the absolute
rating is TTL level (0 to 5VDC). When used as digital input the
signal is filtered (48 milliseconds period for debouncing) to allow
for direct connection of buttons or contact closures.
The analog value of each input is digitalized every 16 milliseconds
(sampling rate 62.5 Hz) with a resolution of 10bit (0 to 1023) and
is stored in separate Modbus registers.
On each input a BARIX TS digital temperature sensor can be
attached for precise temperature reading.
All I/O pins are connected to the CPU directly and the absolute
rating is TTL level (0..5VDC). Each output can sink or source up
to 20mA. See 5VDC output for total current limitations !
Hardware ·2
Power supply
requirements
Connectors
Inputs
Case
Outputs

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
A regulated 5VDC output is available to provide power to small
devices, LEDs etc.To prevent overheating of the voltage regulator
the sourcing current of 5VDC and all used outputs combined
should not exceed 24mA @ 30VDCVin, 32mA @ 24VDC Vin,
85mA @ 12VDCVin or 100mA@ Vin <= 11VDC.
The BARIX X8 has an RS-485 host interface, available on a spring
contact connector block.
Besides A and B signals for the differential, bidirectional bus
signal, a third connection is available, commonly referred to as
reference ground. This signal is internally tied to signal ground
via a 100 Ohm series resistor.
Termination resistors are NOT provided on-board. A termination
resistor may be added at each end of the RS-485 bus if required.
The BARIX X8, as well as other Barix I/O extension units, feature
soft pull-up (B) and pull down (A) 10kOhm resistors, which force
the inactive bus to a relatively high impedance, idle condition.
Both A and B line signals are heavily protected against ESD
(Electrostatic Discharge).
Supported interface configurations are
19200 baud, 8bit, even parity, 1 stop bit (**default**)
19200 baud, 8bit, no parity, 1 stop bit
9600 baud, 8bit, even parity, 1 stop bit
9600 baud, 8bit, no parity, 1 stop bit
4 LED indicators on the unit show the conditions CPU heartbeat
as well as RS-485 receive and transmit activity.
The BARIX X8 contains 256 bytes of non volatile configuration
memory (EEPROM) which can be read and (most of it) written via
standard Modbus commands.
Hardware ·3
Configuration
Memory
LED Indicators
RS-485
5VDC output

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Connectors
Eight I/O signals, signal ground and a regulated 5VDC output are
available on J1.
Pin Function Pin Function
1 Signal GND 6 I/O 3
2 I/O 7 7 I/O 2
3 I/O 6 8 I/O 1
4 I/O 5 9 I/O 0
5 I/O 4 10 VCC (5VDC)
For ratings see sections Inputs, Outputs and 5VDC output
in chapter Hardware.
Connectors · 4
Connector Pin out
overview
| 5 | 4 | 3 | 2 | 1 |
| 5 | 4 | 3 | 2 | 1 | J3 J3
J1
J1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10| |10|
J
J5 5
1
1
2
2
3
3
J 4 | 1 | 2 |
LED
LED | 1 | 2 | 3 | 4 | | 1 | 2 | 3 | 4 |
S
e
r
i
a
l
#
J1 Pin out
I/O

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
J3 can be used to connect the supply voltage and the RS-485 bus
to the unit. An additional Reference Ground pin is provided
(connected to the Signal ground of the BARIX X8 via a 100 Ohm
resistor) and can be used for grounding applications.
Pin Function
1 Reference Ground
2RS-485 A
3RS-485 B
4VIN (AC or DC)
5VIN (AC or DC)
The Jumper J4 can be used to connect the 3 Shield pins on J5 to
Signal GND when required.
Pin Function
1 Signal GND
2Shield
Connectors · 5
| 5 | 4 | 3 | 2 | 1 |
| 5 | 4 | 3 | 2 | 1 | J3 J3
J4 Pin out
GND/Shield Jumper
J 4 | 1 | 2 |
J3 Pin out
Power/RS-485

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
J5 provides three pins for connecting shielded cables to the
BARIX X8. The three shield terminals are connected to signal
ground and toVCC via two 10nF capacitors. (See also J4 jumper
for connecting the 3 shield pins on J5 to Signal GND)
Pin Function
1 Shield
2Shield
3Shield
LED Function
1 CPU heartbeat
2RS-485 receive activity
3RS-485 transmit activity
4Reserved
Connectors · 6
LED
LED | 1 | 2 | 3 | 4 | | 1 | 2 | 3 | 4 |
J
J5 5
1
1
2
2
3
3
J5 Pin out
Shield
LED 1..4
Functions

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Protocol support
The BARIX X8 communicates via the Modbus/RTU protocol over
its RS-485 interface.The unit is also configured via writes to
Modbus registers. In addition to the actual I/O registers, a 256
byte information area is accessible which contains device type,
software version, serial number, the configuration as well as user
changeable storage.
Attention:
Writing to registers can take up to 10 milliseconds per address
before being confirmed (Modbus acknowledge).
The following standard Modbus commands are supported by the
BARIX X8. All other commands will be answered with an
exception code. Due to the limited memory resources of the
BARIX X8, the unit cannot receive messages larger than 95bytes
and will ignore these (eg. write multiple register commands).
CMD (hex) Function
03 (0x03) read (holding) register
04 (0x04) read input register
05 (0x05) write single coil
06 (0x06) write single register
16 (0x10) write multiple registers
The BARIX X8 supports some special, Barix proprietary,
commands which have been implemented to ease configuration
and facilitate the use of the BARIX X8 in conjunction with non-
Modbus systems. These commands are:
CMD (hex) Function
68 (0x44) set all outputs on multiple units
69 (0x45) set configuration using serial number
70 (0x46) set coil without acknowledge
71 (0x47) erase firmware, enter download mode with
setting 19200,n,8,1
Protocol support · 7
Supported
Standard
Commands
Special Commands
General

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
The BARIX X8 responds to malformed commands or access
violations with the defined Modbus exceptions.
The command code 68 (hex 44) can be used to set the outputs of
a whole group of BARIX devices very fast and efficiently.
The command is sent via broadcast and can address multiple
units, with one byte per device carrying the information for all 8
outputs.
All devices addressed by this command will synchronously set
their outputs after the command is completely received.
The devices will not send a response to this command.
Command format:
Byte 1 - 0x0 (broadcast address)
Byte 2 - 0x44 (command code)
Byte 3 - ah (first address, hi, always 0)
Byte 4 - al (first address, Modbus address of first device)
Byte 5 - ch (count, # bytes, hi, always 0)
Byte 6 - cl (count, #bytes, lo 8 bit)
Byte 7 - nb (number of bytes following (redundant)
Byte 8...8+nb: data bytes for multiple devices
Byte 8+nb+1: crc1(crc1 according to Modbus spec)
Byte 8+nb+2: crc1(crc1 according to Modbus spec)
Example: a command with al=5, cl=nb=4, data 01,02,04,08
will set the outputs on the BARIX X8 with Modbus address 5 to
01 which means output one on, all others off, outputs on the
BARIX X8 with the Modbus address 6 to 02 which means output
two on, all others off, devices with address 7 and 8 accordingly.
All other devices with Modbus addresses 1..4 and 9..255 are not
affected by the command.
Protocol support · 8
Exceptions
Command 68

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
The command code 69 (hex 45) is used to set a BARIX X8 device
which is connected to the bus and whose address is unknown
(but serial parameters are correct).
The command can also be sent multiple times with different serial
parameters to find the device. The serial number of the device,
which can be found on a label on the unit (format xxx-yyy), needs
to be inserted into this block to address a specific unit. The block
is sent out as a Modbus broadcast.
Bytes 272, 273, 274, 275 of the Modbus register map
(configuration memory positions 16..19) will be written with the
provided information if the serial number matches.
Command format:
Byte 1 - 0x0 (broadcast address)
Byte 2 - 0x45 (command code)
Byte 3 - s1 (serial number, first part)
Byte 4 - s2 (serial number, second part)
Byte 5 - s1 (serial number, first part, repeated)
Byte 6 - s2 (serial number, second part, repeated)
Byte 7 - c1 (configuration data for register 272)
Byte 8 - c2 (configuration data for register 273)
Byte 9 - c3 (configuration data for register 274)
Byte 10 - c4 (configuration data for register 275)
Byte 11 - crc1 (crc1 according to Modbus spec)
Byte 12 - crc2 (crc2 according to Modbus spec)
Despite the broadcast addressing, the unit will respond with an
acknowledge (containing bytes 1..6 plus crc) !
The command code 70 (hex 46) is used to set an BARIX X8
output without a return acknowledgment. The command uses the
exact syntax of the 05 (set coil) command, but the BARIX X8
does not send an answer and is immediately ready to receive the
next message. The command should be sent addressed to the
device address and NOT as a broadcast, otherwise all BARIX X8
units on the bus will react to it.
This command has been added to the BARIX X8 to allow slow
systems, which are not Modbus native and cannot react fast to
serial input (like common home automation systems) to set a
series of outputs of one or multiple BARIX X8 units without the
need to observe Modbus message timeouts, answers etc.
Protocol support · 9
Command 70
Command 69

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
The command code 71 (hex 47) is used to erase the firmware of
a BARIX X8 device which is connected to the bus and whose
address is unknown (but serial parameters are correct). The
command can also be sent multiple times with different serial
parameters to find the device. The serial number of the device,
which can be found on a label on the unit (format xxx-yyy), needs
to be inserted into this block to address a specific unit. The block
is sent out as a Modbus broadcast.
After erasing the firmware the device will go into the download
mode with serial settings 19200,n,8,1.
Command format:
Byte 1 - 0x0 (broadcast address)
Byte 2 - 0x45 (command code)
Byte 3 - s1 (serial number, first part)
Byte 4 - s2 (serial number, second part)
Byte 5 - s1 (serial number, first part, repeated)
Byte 6 - s2 (serial number, second part, repeated)
Byte 7 - crc1 (crc1 according to Modbus spec)
Byte 8 - crc2 (crc2 according to Modbus spec)
Despite the broadcast addressing, the unit will respond with an
acknowledge (containing bytes 1..6 plus crc) !
Protocol support · 10
Command 71

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Configuration
The BARIX X8 is configured via the RS-485 interface using
standard Modbus commands.
If the address of the device is not known, it can be reset to default
parameters by the following method:
•disconnect the device from power supply
•install a wire between pin 8 and pin 9 on J1
•reapply power to the device
The BARIX X8 will lite up all 4 LEDs and the 3rd LED will blink
showing that the default parameters are stored in the non volatile
memory. No communication is possible at this moment.
•disconnect the device from power supply
•remove the wire between pin 8 and pin 9 on J1
•reapply power to the device
Now the device can be addressed on Modbus address 255 using
the following serial settings: 19200 Baud, even parity, 1 stop bit
Configuration · 11
Default Parameters
LED
LED | 1 | 2 | 3 | 4 | | 1 | 2 | 3 | 4 |

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Connecting I/O
The BARIX X8 features 8 I/Os which are set to work as inputs by
default (Reg. 276=00h). The internal pull up resistors are enabled
by default (Reg. 273=FFh). Buttons or contact closures can be
attached to each input and to signal ground as shown in the
schematic below.
I7 I0
The 8 I/Os of the BARIX X8 can be set to work as outputs
(Reg. 276=FFh). LEDs can be attached between each output and
the 5VDC source as shown in the schematic below.
R7 R0
LED7 LED0
Connecting the I/O · 12
Contacts on inputs
LEDs on outputs

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
Each BARIX X8 I/O can be set to work either as input or output.
External device TTL level I/Os can be attached to the I/Os and to
signal ground as shown in the schematic below.
TTL level output
TTL level input
GND O4 I0
One WIEGAND device (keypad, reader) can be interfaced by
connecting output D0 to I/O6 and output D1 to I/O7 which are
both inputs by default.
+Vsupply Vsupply
WIEGAND D0
DEVICE D1
GND
The WIEGAND interface is enabled by setting Bit 6 of register
274 (Reg. 274 OR 40h).
Connecting the I/O · 13
WIEGAND device
TTL devices on I/O

PRODUCT MANUAL - BARIX X8 - V01.05 - 10/26/2006
To check if WIEGAND data is available the register 11 has to be
read. The lower Byte will contain the amount of Bits received.
If it is 00h then no new data was received. The higher Byte
contains a bitmap of found temperature sensors (see next page)
The Bits of the received WIEGAND data are shifted in (from
right to left) into the Registers 12 to 16 (5x16=80 bits max):
Register 12 13 14 15 16
Bit 1.......16 17........32 33........48 49........64 65........80
Example:
Register 11: 2B1A 1Ah=26 Bits
Register 12: A8DF
Register 13: D8CA
Register 12 (Word) Register 13 (Word)
A8 (High Byte) DF (Low Byte) D8 (High Byte) 02 (Low Byte)
10101000110111111101100011001010
1234567891
01 11 21 31 41 51 61 71 81 92 02 12 22 32 4n an an an an an a2 52 6
Note: As the Bits are shifted in from right to left, the Bits in the
last Byte are right aligned. The unused Bits can contain old data !
To obtain correct data the last Byte must be masked.
In the above example with 26 Bits the mask for the last Byte is:
20+ 21= 1 + 2 = 3
Now let us mask the data received:
CAh AND 03h = 02h
So the WIEGAND data in this example is in fact:
A8 DF D8 02
The BARIX X8 keeps this data in the registers 12 to 16 and will
NOT read further WIEGAND data until register 11 is cleared
(Reg. 11 = 00h).
Connecting the I/O · 14