Wiring Master/Slave Units via RS485 Interface | Omega C4EIT/-EIT

2.3.1 Wiring Master/Slave Units via RS485 Interface

RS485 interface uses a two-wire communication system (one for transmitting and one for receiving) plus a common wire to connect to the shield of the cable. It is recommended to use a shielded cable with one twisted pair.

Use of twisted pair and shield will significantly improve noise immunity.

Figure 2.3 shows multi-point, half-duplex RS485 interface connections for the iServer.

Figure 2.2 Multi-point, Half-Duplex RS485 Wiring

Value of the termination resistor is not critical and depends on the cable impedance.

Table 2.3 shows RS485 half-duplex hookup between the iServer serial port and device with RS485 communication interface.

Table 2.3 Half Duplex Hookup

Pin#	iSeries	DEVICE # WITH RS485
Pin 9	+Tx/+Rx (+Transmit/+Receive)	+Tx/+Rx (+Transmit/+Receive)
Pin 10	-Tx/-Rx (-Transmit/-Receive)	-Tx/-Rx (-Transmit/-Receive)
Pin 8	RTN (Common GND)	GND (Common GND)

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Omega C4EIT/-EIT manual Wiring Master/Slave Units via RS485 Interface, Half Duplex Hookup Pin# ISeries

Contents

User’s Guide Page Table of Contents Dhcp DNS List of Figures IServer Diagnostics Assigning an IP Address using iConnectAccessing the iServer’s Home ARP Commands and Responses Data Transmission Characteristics RS485 ILog Error MessagesList of Tables Table K-1 TIP Before You Begin Part Introduction EMC Considerations Accessing Devices Over the Ethernet Description Physical Characteristics and Mounting Part Hardware Network Communication Interface Section Serial Communication Interfaces For Models with -C4EIT Wiring Master/Slave Units via RS485 Interface Half Duplex Hookup Pin# ISeries RJ-45 Pinout Connecting iServer to PC/Hub/Switch/Router Network Communication Interfaces 1 10BASE-T RJ-45 Pinout Part Network Configuration Network ProtocolsEthernet MAC Address Dhcp DNSIP Address Example C\Telnet 192.168.1.200 Serial Interface Configuration Communication Protocol Command Prefix LettersPart Operations LSB MSB Default IP Address Pinging the iServer from a DOS Prompt Access and Configuration Using a Web Browser IServer Login Overview 4a iServer -C4EIT Overview IServer Network Network IServer Serial Page RS485 Serial Port IServer Serial Page Network to Serial IServer Serial Page Packing Techniques IServer Serial Page Multi-Host Connection 10 iServer Configuration Page Ethernet Configuration Date and Time 11 iServer Management Page Email, Snmp Management Email Snmp 12 iServer Management Page Alarm AT&T 13 iServer Security 14 iServer Device Query Device Setup -C4EIT 15 iServer Device Setup Page RS485 -C4EIT 16 iServer Device Parameters Page -C4EIT 17 iServer Device Setup Page -EIT Device Parameters -EIT 18 iServer Device Parameters Page -EIT Readings Readings Device Setpoints Terminal 21 iServer Terminal System 22 iServer System Diagnostics 23 iServer Diagnostics Page 4.5.12.1 Diagnostics Serial Port Diagnostics Ethernet Port Diagnostics Ping Part Specifications Serial Interface -C4EIT Time-Lag, IEC 127-3 recognized Network Interface Serial Interface Electrical Safety EN61010-12001 PartMeasurement Category Transients Overvoltage Surge 1.2 / 50uS pulse Appendix Aglossary Appendix B IP Address Appendix C IP Netmask Mask Dotted Notation Mask Binary Mask Bits Class aClass B Class C Appendix D Ascii Chart Dec Hex BinaryDec Hex Binary Char No Parity No parity Appendix D Ascii Chart Continuation Ascii Control CodesDec Hex Ctrl Key Definition Dec Hex Ctrl Key Definition Char Equiv Figure E-1 Assigning an IP Address using iConnect Appendix E IConnect Software Figure E-2 Accessing the iServer’s Home Appendix F HTTPget Program Communication interface skip for embedded ethernet -EIT \iServerhttpget -r -S *02X01\r Network read timeout \iServerhttpget -r -S *02X01\r 192.168.1.2002000 Arp -g ﬁ Same as arp -a 192.168.1.96Appendix G ARP Program Admin Port Appendix H Telnet Setup ISeries? Figure H-3 Telnet Setup iServer Help Figure I-1a Serial Tunneling iSeries -C4EIT Figure I-1b Serial Tunneling iSeries -EIT Figure I-2 Device-to-Device Communication Remote iSeries -EIT/-C4EIT Local iSeries -EIT/-C4EIT Figure I-3 Serial Multi-Host Connection -C4EIT Tunneling Troubleshooting IPORT, COM Port Redirector IPORT OverviewAppendix J IPORT Figure J-2a Redirect Serial Connection Figure J-3 iPORT Main Window IPORT Configurations Figure K-1 iLog Software Logging Data for an iSeries Appendix K ILog Software Wireless Devices Table K-1 iLog Excel ApplicationsNetworked Product ILOG File Alternate ISeries Table K-2 iLog Error Messages Error # Description Page Page Page Page Page WARRANTY/DISCLAIMER Shop on line at omega.com