Simex SUR-W410, User Manual

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User manual - METER SUR-W410
10. THE MODBUS PRO TOCOL HANDLING
Transmission parameters: 1 start bit, 8 data bits, 1 or 2 stop bit (2 bits are send, 1 and 2 bits
are accepted when receive), no parity control
Baud rate: selectable from: 1200 to 115200 bits/second
Transmission protocol: MODBUS RTU compatible
The device parameters and display value are available via RS-485 interface, as HOLDING-
type registers (numeric values are given in U2 code) of Modbus RTU protocol. The registers
(or groups of the registers) can be read by 03h function, and wrote by 06h (single registers) or
10h (group of the registers) accordingly to Modbus RTU specification. Maximum group size for
03h and 10h functions can not exceeds 16 registers (for single frame).
The device interprets the broadcast messages, but then do not sends the answers.
10.1. LIST OF REGISTERS
Register Write Range Register description
01h No -999 ÷ 9999 Measurement value (no decimal point)
02h No
0h, A0h, 60h,
C0h, 10h,
20h
The status of the current measurement; 0h - data valid; A0h - top
border of the measurement range is exceeded; 60h - bottom border
of the measurement range is exceeded; C0h - sensor failure; 10h -
error of user characteristic; 20h - waiting for the first measure
03h Yes 0 ÷ 3
“ Pnt ” parameter in “ InPt ” menu (decimal point position)
0 - “ 0 ”; 1 - “ 0.0 ”; 2 - “ 0.00 ”; 3 - “ 0.000 ”
04h 6 Yes see descr.
State of the relays and alarm LED (binary format)
(1 - on, 0 - off):
00000000 000edcba
a - relay R1; b - relay R2; c - relay R3; d - relay R2; e - alarm LED;
If written, only a , b , c , d bits are important (others are ignored)
these bits allows user to control the relays via RS-485 interface
05h 1 Yes 0h ÷ 1800h
State of current output, expressed in 1/256 mA units – it means that
high byte express integer part, and low byte fractional part of
desired output current.
06h No -999 ÷ 9999 Peak (drop) value (no decimal point)
08h No 0 ÷ 50 Temperature inside device housing expressed by 1°C
10h Yes 0 ÷ 20
“ tyPE ” parameter in “ InPt ” menu (nominal input range):
0 - 0-20 mA range; 1 - 4-20 mA range; 2 - 0-5 V range;
3 - 1-5 V range; 4 - 0-10 V range; 5 - 2-10 V range;
6 - 0-60 mV range; 7 - 0-75 mV range; 8 - 0-100 mV range;
9 - 0-150 mV range; 10 - Pt-100; 11 - Pt-500; 12 - Pt-1000
13 - thermocouple input K; 14 - thermocouple input S;
15 - thermocouple input J; 16 - thermocouple input T;
17 - thermocouple input N; 18 - thermocouple input R;
19 - thermocouple input B; 20 - thermocouple input E;
11h Yes 0 ÷ 3
“ CHAr ” parameter in “ InPt ” menu (characteristic type)
0 - linear ; 1 - square; 2 - square root; 3 - user defined
12h Yes 0 ÷ 255 “ FiLt ” parameter in “ InPt ” menu (time constant in seconds)
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