AST EL50 User Manual

19
Chapter - 9
Serial communication protocol-MT500
This protocol is developed to use in the half duplex addressable communication mode. Master device should periodically issue
requests to each Slave device. The request contains an address of polling “Slave” device. Slave device reply only on the requests
issued by Master. Each Slave has its own address to recognize the issued request. AST sensors always operate as Slave devices. Using
RS485 serial communication option allows connecting more than one sensor to Master device. AST sensors always perform delay of
5 ms before sending an answer on Master request to meet RS485 hardware requirement.
MT500_AST protocol uses only RD (Batch Read) and WD (Batch Write) commands. Sending other MT500 protocol commands causes
sensor to consider it as error condition and answer with unknown command reply. Symbols enclosed within apostrophes (‘symbol’)
means ASCII representation of the symbols. String enclosed with quotation mark (“string”) means ASCII representation of the string
(ended by ‘\0’). Data format is: 8 data bit, 1 stop bit, No parity, baud-rate 19200.
'0303' '01'
Clear time(tCL)
Adjustable between 0 to 12, Default 0, 0=OFF, 1=Auto. 2-12 = 10msec
to 25sec [refer to page-13(clear time)]
'0F00' '01'
Laser control
'0000': LASER OFF; '0001': LASER ON (Default)
'1700' '01'Set point
Set point for relay actuation (only for E –series pyrometers)
'1800' '01'Hysteresis
Hysteresis value relay actuation
'1801'
'01'
LCD back light control
' ' ' '0000 : BL OFF; 0001 : BL ON(Default) (Only for E-series pyrometers)
Description Address Items Parameters
Emissivity
'0400' '01'
Object emissivity multiplied by 1000.
Refer user manual for adjustable range.
Emissivity slope parameter multiplied by 1000.
Refer user manual for adjustable range.
Parameter specifies analog and serial output response time.
See Table 1.
'0401' '01'
'0105' '01'
Emissivity slope
Response time (τ)
Upper measurement range limit in °K (read only)'0100' '01'
Upper basic range
Lower measurement range limit in °K (read only)
'0101' '01'
Lower basic range
'0000': 4 to 20 mA (Default); '0001': 0 to 20 mA,
'0002': 0 to 10 Volt; '0003': K type TC; '0004': J type TC
'0F01' '01'Analog output type
Upper analog scale value in °K'0102' '01'Upper sub range
Lower analog scale value in °K'0103' '01'Lower sub range
Adjustable between '0001' to '0255''0200' '01'Station number
Flag is used to instruct PC SW to show temperature
'0000': Centigrade (Default); '0001': Fahrenheit
'0201' '01'Temperature unit
Parameter multiplied by 10.
Adjusted between 0 and 100%, Default set to 15%.
'0107' '01'
Switch off level
'0000' = Single color; '0001' = Two color
This parameter is useless for single color sensors.
'0204' '01'Sensor mode
Temperature inside device case in °C (read only)'0006' '01'Internal temperature
'0007' '01'Head temperature
Temperature inside optical head m°C(only for E –series pyrometers)
(read only)
Communication type selection
'0F03'
'01'
' ' ' '0000 :RS-485;, 0001 : RS-232 (Default)
Device name
‘1D00'
‘01'
10 Bytes “Hot end “, if less then 10 bytes pad with space at end.
Working distance (mm)
‘1D01' ‘01'
10 Bytes “1000 “, if less then 10 bytes pad with space at end.
Spot size-apperture (mm)
‘1D02'
‘01'
10 Bytes “1000-6000” if less then 10 bytes pad with space at end.
‘-’ sign between spot size and apperture is compulsory
Relative energy (read only)
‘0002'
‘01'
Relative energy multiply by 1000 for 2 color pyrometers only

AST EL50 Specifications

General

Brand	AST
Model	EL50
Category	Measuring Instruments
Language	English