Serial Communication - gefran I300 Bedienungsanleitung

The I3X4Y has a serial communication system that allows use of a "supervisor" to read data, set setpoints, reset alarms, configure the
instrument, etc.
Physical connection and communication protocol
- RS 485: EIA standard, differential signal, instruments connected in parallel with 2-lead wire (up to 32 I300s without repeater).
To guarantee correct polarity when wiring the RS 485 network, the communication card is fit with 301 kΩ resistors that connect lines A and B to
the +5V and 0V terminals.
- Communication protocol: Modbus / J.Bus, in slave mode - binary code (RTU).
- 8 character bits, 1 start bit, 1 stop bit, no parity.
- Configurable baud rates: 1200, 2400, 4800, 9600 or 19200 baud.
- Each instrument must be identified by a slave address numbered from 1 to 63.
- Instruction codes: 3 or 4
6
16
Any decimals in the data will not be transmitted.
- Error codes: 1 : unknown function
2 : incorrect address
3 : incorrect data
4 : instrument busy or not ready
Addresses and access to parameters and variables
Addresses in Modbus protocol are identical to those in J.BUS - 1 protocol. Addresses not shown are reserved to the system.
Address
J-BUS
1
2
3
4
5
10
11
12
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
222
223
224
225
226
6 • OPERATION

SERIAL COMMUNICATION

: read n words
: write 1 word
: write n words (max. 10 consecutive words)
Access Label
L MES.U1
L MES.U2
MES.nL
L
L MES.nH
L MES.Au
L TOT.LSB
L TOT.MSB
L TOT.EXP
Y1
L/E
L/E Y2
L/E Y3
L/E Y4
L/E H1
L/E H2
L/E H3
L/E H4
L/E t1
L/E t2
L/E t3
L/E t4
L/E b1
L/E b2
L/E b3
L/E b4
L/E oL
L/E oH
L/E oF
L/E Fi
L/E CJ
L/E Lo
L/E Hi
L/E tb
L/E AL.1
Parameters or variables
Value displayed by channel 1
Value displayed by channel 2
Minimum value saved
Maximum value saved
Mean value in totalizing time
Totalizing : LSB value of mantissa
Totalizing: MSB value of mantissa
Totalizing: exponent value
Alarm setpoint Y1
Alarm setpoint Y2
Alarm setpoint Y3
Alarm setpoint Y4
Hysteresis H1 of setpoint Y1 : 0÷200
Hysteresis H2 of setpoint Y2 : 0÷200
Hysteresis H3 of setpoint Y3 : 0÷200
Hysteresis H4 of setpoint Y4 : 0÷200
Alarm timing Y1 : 0÷10
Alarm timing Y2 : 0÷10
Alarm timing Y3 : 0÷10
Alarm timing Y4 : 0÷10
Alarm band setpoint Y1: 0÷250
Alarm band setpoint Y2: 0÷250
Alarm band setpoint Y3: 0÷250
Alarm band setpoint Y4: 0÷250
Min. scale analog output
Max. scale analog output
Values offset: ± 500
Data acquisition filter: 0÷20
Cold junction value TC input
Min. scale
Max. scale
Setpoint detect line interrupt
- bit 0 = alarm state 1, ..., Bit3= alarm state 4
0 = No alarm 1 = alarm
- Bit 0 setpoint Y1, bit 1 setpoint Y2,
bit 2 setpoint Y3, bit 3 setpoint Y4.
- Bit 4 set min. and max. values
saved in RH /°t input: 0 = t°, 1 = Rh
- Bit 5 assign relay r4 :
0 = setpoint Y4 1 = setpoint Y2 assigned to r2
- Bit 6 assign relay r3:
0 = setpoint Y3 1 = setpoint Y1 assigned to r1
63