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Digital Electronics Corporation Pass-Through Function Guide

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1Pass-Through Function Guide1General Description.........................................................................................................22Install................................................................................................................................63Setting............................................................................................................................134Error Messages..............................................................................................................195Appendix........................................................................................................................20Pass-Through Function Guide GP-Pro EX Device/PLC Connection Manual21General Description1.1What is the Pass-Through Function?When communicating with the external devices using Windows applications such as ladder software that uses serial interfaces, the ladder software and external device need to be serially interfaced.Example)1. PC with a ladder software installed.2. External device to be communicated with.3. Serial interfaceOn GP-Pro EX, using the pass-through function enables communication between the ladder software and external device through an indicator.Example)1. PC with as ladder software installed.2. External device to be set.3. Indicator to relay serial interface.4. USB Transfer Cable (*1) or Ethernet (UDP) connection.5. Connecting cable corresponding to the external device.*1 The USB transfer cables you can use differ between display units. For more information, refer to the GP-Pro EX Reference Manual's "Transferring Project Files via USB Transfer Cable".Using the pass-through function makes connecting cables unnecessary when changing the settings of external devices with the ladder software.12312345Pass-Through Function Guide GP-Pro EX Device/PLC Connection Manual3When using the WinGP, installing the WinGP and the ladder software in one PC enables usage of the pass-through function in the following configuration.Example)1. PC with the WinGP and ladder software installed 2. External device to be set 3. Connecting cable corresponding to the external device •WinGP needs to be registered in the pass-through function setting tool. Enter the PC's IP address to search for the indicator. We recommend entering the loopback address (127.0.0.1) for the IP address."3.1.2 Setting with Pass-Through Function Tool" (page 17)123Pass-Through Function Guide GP-Pro EX Device/PLC Connection Manual41.2Mechanism of the Pass-through FunctionThe Pass-Through function is a mechanism for the associate virtual port on the PC to communicate with the serial interface port of the external device.Hereinafter, the virtual port on the PC is to be referred to as “virtual COM.”Example)By setting the virtual COM “Port 1’” in communication setting of the ladder software, the system operates as if it is connected to port 1 of the external device.To implement this operation, the pass-through function setting tool, virtual COM bus driver, and virtual COM port driver are used.1. Port 1 of external device for serial interface.2. Hereinafter, the virtual port on the PC is to be referred to as “virtual COM.”The Pass-Through function setting tool and virtual COM bus driver, virtual COM port driver provide the functions below.•Make port 1’ on the PC: Virtual COM port driver•Associate port 1’ with port 1: Pass-Through function setting tool•Exchange data of port 1’ and port 1: Virtual COM bus driverThe Pass-Through function enables communication with the external devices using the installed virtual COM ports. However, only up to 4 virtual COM ports can be used simultaneously.To communicate with multiple Device/PLCs, online the COM port associated with the Device/PLC in the GP-Pro EX [Pass-Through Configuration Tool] ."3.1 Setting with Pass-Through Function Setting Tool" (page 13)Example)121234Pass-Through Function Guide GP-Pro EX Device/PLC Connection Manual51.3Operation EnvironmentThe following environment is required to use the Pass-Through function.Compatible with GP-Pro EXGP-Pro EX Ver.1.1 or higher.GP-Pro EX Ver.2.5 or higher is required for using WinGP.Compatible OSMicrosoft® Windows® XP (32-bit versions: SP2 or later)Microsoft® Windows Vista® (All editions of 32-bit versions)Microsoft® Windows® 7 (All editions of 32-bit/64-bit versions)Microsoft® Windows® 8 / Microsoft® Windows® 8.1 (All editions of 32-bit/64-bit versions)Microsoft® Windows® 10 (32-bit/64-bit versions of Home, Pro, and Enterprise)Precautions •When using the Pass-Through Function, do not allow the computer to switch to standby (Windows XP), sleep (Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10), or hibernation modes when communicating with External Devices. If the computer is allowed to switch to one of these modes, communications with the External Device will be interrupted.•When it takes a long time for External Device to respond (e.g. writing to RAM), set the larger value to [Timeout] in [Communication settings] than the response time from External Device.•When data is transferred with the pass-through function during execution of the logic function, an error may occur in the middle of transferring the data. If the error occurs, stop the execution of the logic function and transfer the data, or transfer the data without using the pass-through function.

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