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ICS Modbus Interface Board 4819A
OEM GPIB <-> RS-232 Modbus Interface Board
● Converts simple ASCII commands into Modbus RTU messages. Relieves user from having to generate and check RTU packets.
● Expanded Modbus RTU Command Set now includes Floating Point commands. Controls a wider range of Modbus devices.
● Provides GPIB-to-RS-232 and RS-232-to-RS-232 data paths to Modbus device. Use GPIB or RS-232 to control the Modbus device.
● IEEE-488.2 Compliant. Meets latest GPIB Standards.
● Saves GPIB address, serial settings and user IDN message in non-volatile memory. Personalize the 4819 as part of your system.
● Mounts directly to host chassis' rear panel. Easy installation eliminates extra cables and reduces cost.
● Operates on 5 to 15 Volts. Runs on any power supply.
ICS Modbus Interface Board 4819A GPIB<->Modbus Interface is an IEEE 488.2/GPIB to Serial Interface that easily adapts Modbus slave devices to the GPIB or HP-IB bus. The 4819A lets the user send simple read-write messages on the GPIB bus to control and query slave Modbus devices. The ICS Modbus Interface Board 4819A does all of the Modbus packet formatting and handles the response packets. The 4819A also provides all of the required IEEE-488.2 functions and an expanded IEEE-488.2 Status Reporting Structure to report Modbus communication errors. The ICS Modbus Interface Board 4819A firmware has an expanded Modbus command set and now includes 32-bit floating point commands so it can control newer temperature controllers. The 4819A is fully backward compatible with the earlier 4819 board.
Typical applications are adding a GPIB control to a temperature chamber or to a system that has a Modbus RTU interface.
IEEE 488 Bus Interface |
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Address Capability | Primary addresses 0 ~ 30. Address set by GPIB bus command. Address displayed on LED indicators at power turn-on. | ||||||
SRQ Generation | SRQs are generated per the IEEE-488.2 specification when the unit is not addressed to talk and an enabled bit in the ESR, Questionable or Conditional register becomes set. ESR bits are: Modbus Error Register set Serial Buffer full Command error Serial error Execution error Query error Power on |
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Buffers |
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488.2 Common Commands | *CLS, *ESE, *ESE?, *ESR?, *IDN?, *OPC, *OPC?, *RST, *SAV, *SRE, *SRE?, *STB, *TST? and *WAI. |
Serial signals conform to EIA Specifications for RS-232 signals. J2 is a DTE type interface with DTR, CTR and RTS signals pulled to +V. J3 is a DCE type interface with DCD and DSR signals pulled to +V.
Signals | TXD, RXD, GND |
Baud Rates | 300 ~ 57.6 Kbaud |
Data Bits | 7 or 8 bits |
Parity | Odd, Even or None |
Stop Bits | 1 or 2 |
GPIB Bus Address
Baud rate select
7/8 data bits
1/2 stop bits
Odd/even/none parity
User IDN Message
Modbus timeout
Indicators | |
Six on board LEDs show self test diagnostics, GPIB address and status. | |
PWR | On when power applied |
RDY | On when passed self test |
MTA | On when talk address recognized |
MLA | On when listen address recognized |
SRQ | On when SRQ generated |
ERR | On when ESR register bit set |
GPIB | 24-pin IEEE-488 connector with metric lock studs. |
Ext. Serial | 9-pin DE shell male connector with 4-40 lock studs. |
Int. Serial | 9-pin DE shell female connector with 4-40 lock studs. |
Operation Temperature | -10 °C ~ +70 °C |
Storage Temperature | -40 °C ~ +85 °C |
Humidity | 0-90% RH without condensation |
Construction | Four layer fire-resistant PCB. Connector shells are connected to chassis ground. |
Configuration Disk with sample programs