Seneca S312A-4-H-4R, Manual

Page: 9 / 21

The indicators have MODBUS 16 bits (words) S312A-4-L-4R and S312A-4-H-4R lines
registers, accessible by RS485 serial communication.
10.1 Supported MODBUS Commands
Code
03
06
16
Function
Read Holding Registers
Write Single Register
Write Multiple Registers
Description
Reading of word registers up to at a time.
16
Writing
of a word register.
Writing of word registers up to 6 at a time. 1
 : communication error with the cold junction thermometer.
 : at the start may signal an error on the calibration memory. The functioning of the
module is blocked while the Modbus communication is available.
 : Instantaneous value to display < value of the 2.5% or instantaneous value to 
display < minimum displayable.

: Instantaneous value to display > value of the 2.5% or if the instantaneous value >

maximum displayable.
The errors are directly viewed through display.
We are going to list all the possible signallings with the correspondent meaning:
8. ERROR SIGNALLINGS
10. MODBUS REGISTERS

: Burn-out of the temperature sensor.
9. ORDER CODES
Code
Model
Display
Power Supply
Output relay
Description
S312A Indicator with universal analog input, 4 relays.
-4
4 digits
85..265 V
AC
10..40 V / 19..28 V
DC AC
4 output relay
-H
-L
-4R
ENGLISH - 9/21 MI00250 -E 3
Options
Calibration and configuration Service
/T