4.6. FACTORY DEFAULT
In case of faulty functioning the ADA-401WA as:
- no communication in the configuration mode,
- transmission errors on the RS485/422 bus,
- transmission errors on the 1-Wire bus,
can be restored the factory default setting in the internal registers of converter.
Factory default
Parameters
RS485/RS422
Interface
1-WIRE
Interface
Addressing converter - Available
Disable
Addressing converter - Address
64 – disable
Baud rate
9600bps
standard
Number of data bits
8
---
Parity control
non
---
Stop bit
1
---
Interval between frames in characters
4
10
Interval between bytes [ms]
---
3
To restore the factory default setting, set SW1 microswitch mode as in the table below
SW1-1
SW1-2
OFF
ON
Disconnect the power and after while connect again. After that, will be loaded the factory default setting.
After this operation should return to run mode by setting micro- switch section of SW like in table below.
SW1-1
SW1-2
OFF
OFF
The yellow LED will be OFF.
4.7. OPERATION
ADA-401WA addressable converter operates as node for 1-WIRE network. Each node can be addressed and connected to RS485
bus and enable to communication of many fragmented of 1-WIRE networks with remote monitoring system e.g. temperature.
It is possible to extend the length of RS485 bus about additional segments:
–
1200m by adding ADA-4040 RS485 repeaters,
–
2500m by adding fibre-optic to RS485 ADA-7040 converters.
On RS-485 bus a protocol frame for 1-WIRE devices connected to ADA-401WA converter should be created as follows:
ADDRESS OF ADA-401WA
FRAME OF DS2480B DRIVER 1-WIRE BUS
Where:
ADDRESS OF ADA-401WA CONVERTER
- address byte from the scope 1-255,
FRAME OF DS2480B DRIVER 1-WIRE BUS
- bytes sequence contains DS2480B driver frame of 1-WIRE bus
or additional orders for ADA-401WA.
This sequence can not be longer than 950 bytes.
ADA-401WA converter with fixed addressing constantly listens for frames on RS485 bus. If received frame contains byte of address
equal to converter address then another bytes of frame are received up to silence on RS-485 bus equal to 'space between frames in
signs'. If frame is received correctly, the address byte is deleted and transmitted over as typical to the driver of the 1-WIRE DS2480B
bus. In case of errors in received frame, it isn't transmitted to the DS2480B driver. In this case should be send the previous frame. The
frame received from device connected to 1-WIRE port is being tested of transmission errors and in case of their missing converter
adds address to beginning of frame and send it to RS-485 bus. Frame containing errors isn't being transmitted to RS485 port.
Converter receive only 950 characters and in case of transmitting of frames containing more than 950 bytes is ignoring them.
ADA-401WA was equipped with separate buffers for RS485 port and 1-WIRE therefore converter can operate at full duplex mode on
RS-485 4-wire bus.
4.8. ADDITIONAL COMMANDS
ADA-401WA has implemented additional commands, which can be used in software development and there are as follow:
Command
CODE [HEX]
Description
BREAK
C1-C1-C1
BREAK commend replaces the standard issue of BREAK signal on the Tx line of RS232
interface (driver DS2480B reset).
In order to implement reset and calibration DS2480B driver must be sent to ADA-401WA
sequence of bytes described in the Code column.
11
ADA-401WA
Summary of Contents for ADA-401WA
Page 14: ...14 ADA 401WA ...
Page 15: ...15 ADA 401WA ...
