ATI Technologies Q46 Series Communications Manual
Modbus communications manual
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Modbus Communications Manual
Home Office
Analytical Technology, Inc.
6 Iron Bridge Drive
Collegeville, PA 19426
Phone: 800-959-0299
610-917-0991
Fax:
610-917-0992
Email: sales@analyticaltechnology.com
O & M Manual
Model Q46
European Office
ATI (UK) Limited
Unit 1 & 2 Gatehead Business Park
Delph New Road, Delph
Saddleworth OL3 5DE
Phone: +44 (0)1457-873-318
Fax:
+ 44 (0)1457-874-468
Email: sales@atiuk.com
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Table of Contents
Related Manuals for ATI Technologies Q46 Series
Summary of Contents for ATI Technologies Q46 Series
- Page 1 O & M Manual Model Q46 Modbus Communications Manual Home Office European Office Analytical Technology, Inc. ATI (UK) Limited 6 Iron Bridge Drive Unit 1 & 2 Gatehead Business Park Collegeville, PA 19426 Delph New Road, Delph Phone: 800-959-0299 Saddleworth OL3 5DE 610-917-0991 Phone: +44 (0)1457-873-318 Fax:...
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Page 2: Table Of Contents
Table of Contents Part 1 – Modbus Description ____________________________________________________________ 3 Modbus Technical Overview......................3 Modbus Connection ........................5 Registers and Coils ........................5 RS-485 Communication ....................... 6 Cable Specification ........................7 RS-485 Line Drivers/Receivers ....................8 120 Ohm Termination ........................8 Bias .............................. -
Page 3: Part 1 - Modbus Description
Part 1 – Modbus Description Modbus Technical Overview Modbus protocol is a messaging structure, widely used to establish master-slave communication between intelligent devices. A message sent from a master to a slave contains a one-byte slave address, a one-byte command, data bytes (depending on command), and a two byte CRC. The protocol is independent of the underlying physical layer and is traditionally implemented using RS232, RS422, or RS485 over a variety of media (e.g. -
Page 4: Figure 1 - Modbus Terminal Connections
Q46 Modbus Communications Manual The data field can be nonexistent (of zero length) in certain kinds of messages. For example, in a request from a master device for a slave to respond with its communications event log (function code 0B hexadecimal), the slave does not require any additional information. The function code alone specifies the action. -
Page 5: Modbus Connection
For this reason, the Q46 Series transmitter organizes all of its data into input registers only, or more specifically, data is organized into the holding registers starting at 30001. -
Page 6: Rs-485 Communication
Q46 Modbus Communications Manual RS-485 Communication Modbus data transmission is an RS-485 based communication protocol. The RS485 standard specifies a two-wire, half-duplex serial data bus for connecting up to 32 devices in parallel, at distances of up to 4000 feet at transmission rates at or below 100KHz. The RS485 standard allows the user to configure inexpensive local networks and multi-drop communications links using a twisted pair cable. -
Page 7: Cable Specification
Q46 Modbus Communications Manual The master node may be located anywhere on the network, not just at one end. Slave Slave Master Slave Slave Cable Specification The bus is a cable composed of a twisted pair of wires with a characteristic impedance of 120 ohms, and a 120-ohm termination resistor connecting the pair of wires at each end. -
Page 8: Rs-485 Line Drivers/Receivers
Biasing the transmission line keeps it in the idle state while it is not driven. The bias resistors maintain a differential of 200mV between the A and B lines. Note that bias resistors are not required for Q46 Series transmitters, as the Modbus driver includes a “Failsafe” built-in Bias Design. -
Page 9: Drops
Q46 Modbus Communications Manual Drops Often, a short length of cable is used at a junction box to form a branch, or “drop”, from the bus to the device. These cables must very short as compared to the main trunk length of the bus so as to avoid signal reflections and require termination that would load the bus excessively. -
Page 10: Shielding
(from a few volts to a few hundred volts depending on the situation). Note that Q46 Series transmitters are galvanically isolated from the RS-485 (Modbus) port. And utilize extensive spike/surge protection from lightening and other electrical sources. -
Page 11: Figure 2 - Modbus Set-Up Screen
Q46 Modbus Communications Manual Figure 2 - Modbus Set-up Screen O&M Manual Rev-D (2/16) -
Page 12: Q46 Register Assignment
The following table summarizes the registers used for the Modbus data in the Q46 communication board using the Q46D as an example. Tables for all other Q46 series monitors follow. As mentioned previously, the Q46 only supports the “04 – Read Input Register” function. -
Page 13: Figure 4 - Status Register Bitfield Flags
Q46 Modbus Communications Manual Detailed status data from registers 30009 and 30010 are detailed in Figure 4 below. Register Bitfield Description 0 (lsb) mV Hi mV Lo D.O. Hi D.O. Lo Temp Hi Temp Lo 30009 EE Fail LCD Controller Fail Cal D.O. -
Page 14: Q46H/62, Q45H/63 Or Q46H/79Pr Residual Chlorine Tables
Q46 Modbus Communications Manual Q46H/62, Q45H/63 or Q46H/79PR Residual Chlorine Tables Q46H/62/63/79PR Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) 1 to 4 long(32) Chorine Measured Chlorine 1.4920 PPM = 14920 30002 (LO) 30003 (HI) Measured 5 to 8 long(32) -
Page 15: Q46H/64 Dissolved Ozone Tables
Q46 Modbus Communications Manual Q46H/64 Dissolved Ozone Tables Q46H/64 Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) 1 to 4 long(32) Ozone Measured Ozone 1.4920 PPM = 14920 30002 (LO) 30003 (HI) Measured 5 to 8 long(32) Ozone 25.00°... -
Page 16: Q46H/65 Dissolved Chlorine Dioxide Tables
Q46 Modbus Communications Manual Q46H/65 Dissolved Chlorine Dioxide Tables Q46H/65 Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) Measured Chlorine 1 to 4 long(32) Chorine 1.4920 PPM = 14920 30002 (LO) Dioxide 30003 (HI) 5 to 8 long(32) Chlorine Measured Temperature... -
Page 17: Q46P & Q46R Ph And Orp Tables
Q46 Modbus Communications Manual Q46P & Q46R pH and ORP Tables Q46P or Q46R Input Register Detail Data Register Byte Sensor Description Data Format Type 30001 (HI) Measured pH 7.00 pH = 700 1 to 4 long(32) 30002 (LO) Measured ORP -137 mv = -137 30003 (HI) 5 to 8... -
Page 18: Q46N Total And Free Ammonia Tables
Q46 Modbus Communications Manual Q46N Total and Free Ammonia Tables Q46N & Q46FN Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) Measured Total 1 to 4 long(32) Ammonia 1.00 PPM = 100 30002 (LO) Ammonia 30003 (HI) 5 to 8 long(32) -
Page 19: Q46C4 Or Q46Ct Conductivity Tables
Q46 Modbus Communications Manual Q46C4 or Q46CT Conductivity Tables Q46C4 & Q46CT Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) Measured 1 to 4 long(32) Conductivity 2.238 mS = 2238 30002 (LO) Conductivity 30003 (HI) Measured 5 to 8 long(32) -
Page 20: Q46F Fluoride Tables
Q46 Modbus Communications Manual Q46F Fluoride Tables Q46F Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) 1 to 4 long(32) Fluoride Measured Fluoride 1.000 PPM = 1000 30002 (LO) 30003 (HI) Measured 5 to 8 long(32) 25.00°... -
Page 21: Q46T Turbidity Tables
Q46 Modbus Communications Manual Q46T Turbidity Tables Q46T Input Register Detail Register Byte Data Type Sensor Description Data Format 30001 (HI) 1 to 4 long(32) Turbidity Measured Turbidity 0.16 NTU = 16 30002 (LO) 30003 (HI) Measured 5 to 8 long(32) Turbidity 25.00°... - Page 22 PRODUCT WARRANTY Analytical Technology, Inc. (Manufacturer) warrants to the Customer that if any part(s) of the Manufacturer's equipment proves to be defective in materials or workmanship within the earlier of 18 months of the date of shipment or 12 months of the date of start-up, such defective parts will be repaired or replaced free of charge.
- Page 23 WATER QUALITY MONITORS GAS DETECTION PRODUCTS Dissolved Oxygen Ammonia Carbon Monoxide Free Chlorine Hydrogen Combined Chlorine Nitric Oxide Total Chlorine Oxygen Residual Chlorine Dioxide Cl2 Phosgene Potassium Permanganate Bromine Chlorine Dissolved Ozone Chlorine Dioxide pH/ORP Fluorine Conductivity Iodine Hydrogen Peroxide Acid Gases Peracetic Acid O Ethylene Oxide...
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