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Modbus Communications and Connectivity
20
5.3 Physical Connection
A Modbus network should consist of one, and only one, host client, and
up to 255 slaves uniquely identifiable by their slave ID. The slave ID
of each OpenComms NIC is set through the service terminal (configu-
ration) port. (See section 3, System Configuration for more details.)
The OpenComms NIC supports multi-drop connection over RS485. On
the OpenComms NIC, a client should connect to the OpenComms NIC
as a multi-drop connection via the RS485 “Repeater” port (TB2), (Pin1
as minus and Pin2 as plus. J28-1 and J28-2 should be shorted.)
The OpenComms NIC card is designed to reside on a maximum com-
mon line of 32 devices with a total cable length of 4000 feet. In a “nor-
mal environment” all devices should be connected in “daisy-chain”
fashion, with “star configurations” or branches, being used at a mini-
mum. See Figure 6 for details. A “normal environment” consists of an
installation where noise or electrical interference is minimal. This is
typical of communication wiring run in properly grounded conduit or
in areas where high voltage or radio transmissions are not present.
Otherwise, these conditions are designated as “noisy.”
Figure 6 Typical maximum installation
The recommended cable characteristics are:
Normal Environments:
• 18-22 gauge, twisted-pair, stranded (non- shielded)
Typical type is: Belden 8442
Noisy Environments:
• 18-22 gauge, twisted-pair, stranded (shielded)
Typical type is: Belden 9461
Modbus RTU Master
EIA-485 9600,N,8,1
Maximum of 32
devices with combine
cable length of 4000
feet
- OpenComms NIC 1
- TABLE OF CONTENTS 3
- 1.0 INTRODUCTION 7
- 1.1 OpenComms Compatibility 8
- [email protected] 9
- Table 2 Specifications 10
- 2.0 INSTALLATION 11
- 2.3.1 Network Port 12
- 2.3.2 BMS Port 12
- Installation 14
- 3.0 SYSTEM CONFIGURATION 15
- System Configuration 16
- Network Settings Menu 17
- BOOTP and DHCP Mode 17
- SNMP Communications Menu 17
- System Information Menu 17
- Web Server 18
- Change User Name / Password 18
- Firmware Updates Menu 18
- Factory Settings Menu 18
- Auxiliary Communications 19
- 4.0 OPERATION 20
- 4.3 RFC 1628 UPS MIB 21
- Operation 22
- 4.5 HTTP 23
- 4.6 Modbus RTU 23
- 4.7 System Reset 23
- 4.8 Diagnostics 24
- 5.1 Implementation Basics 25
- 5.2 Transmission Format 25
- 5.3 Physical Connection 26
- 5.4 Modbus Slave Functions 27
- 5.4.2 Function Code Support 28
- 5.4.7 Error Handling 29
- Modbus Packet Formats 29
- 5.5 RTU Framing Examples 30
- 6.0 NIC SETUP AND TESTING 31
- 6.2 Testing the Network 32
- 6.4 SNMP Troubleshooting 32
- 6.5 Web Troubleshooting 33
- 6.6 Modbus Troubleshooting 33
- 7.0 FIRMWARE UPDATES 34
- Settings 35
- 7.3 Firmware Update Procedure 36
- Firmware Updates 37
- 8.0 EXTERNAL ENCLOSURES 39
- 9.0 RETROFIT INSTALLATION 40
- Figure 12 ICS control cavity 41
- Microprocessors) 43
- 9.4 Himod (LNA) 44
- 9.5 Mini-Mate2 45
- 9.7 UPS Installation 46
- 9.8 Npower 46
- 9.9 7200 UPS 48
- Retrofit Installation 49
- 9.10 HiPulse UPS 50
- 9.11 Static Switch2 52
- 9.12 STS 53
- MONITORING 56
- USER MANUAL 56
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