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Instruction Manual
RK/REK/REKJ Series Digital Interface
MODEL
Standard Digital Interface
LGob Option
LUs1 Option
LEt Option
*167.9.097*
B/N 167.9.097
Rev. 0.5

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Summary of Contents for Matsusada RK Series

  • Page 1 Instruction Manual RK/REK/REKJ Series Digital Interface MODEL Standard Digital Interface LGob Option LUs1 Option LEt Option *167.9.097* B/N 167.9.097 Rev. 0.5...
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  • Page 3: Table Of Contents

    CONTENTS Page 1 Introduction ....................................1 1-1 Introduction ................................. 1 1-2 Unpacking the unit ..............................1 1-3 Environmental requirements ..........................1 1-4 Notes ..................................... 1 1-5 Notes at digital connection ........................... 2 2 Exterior view diagram ................................3 2-1 Standard Digital Interface ........................... 3 2-2...
  • Page 4 5-2 Multiple command ..............................26 5-3 Character set for the command ........................27 5-4 Returned data ................................. 27 6 Getting started ..................................28 6-1 CO-MET2-25/CO-MET2-9/CO-MET4-25, Standard Digital Interface ........28 6-2 CO-G32m, Standard Digital Interface ......................29 6-3 CO-U32m, Standard Digital Interface ......................30 6-4...
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  • Page 7: 1 Introduction

    1 Introduction 1 Introduction 1-1 Introduction Thank you very much for your purchase of our product. We have done our best for our quality control of out products. Please handle this unit properly according to this instruction manual so that you can use the full capacity of this unit and operate it safely and smoothly in high efficiency for long.
  • Page 8: 1-5 Notes At Digital Connection

    1 Introduction 1-5 Notes at digital connection Please make “M_S”; Master/Slave setting on the start menu “OFF”, for digital connection. * Master is also available. But communication may be late. Slave setting Master/Slave “OFF”Setting REMOTE OUTPUT OVP/ LOCK * When -LUs1 / -LGob / -LEt optional models which do no function-settings switch on the rear panel are communicated to an external controller or PC, it needs to set “Int.
  • Page 9: 2 Exterior View Diagram

    2 Exterior view diagram 2 Exterior view diagram 2-1 Standard Digital Interface RK(400W) Series Rear panel ① ② ① CO-M cable connector (IN) ② CO-M cable connector (OUT) ③ Master/Slave setting switch ④ UNIT number setting switch RK(800W) Series RK(1200W) Series Rear panel Rear panel ①...
  • Page 10: 2-2 Lgob Option

    2 Exterior view diagram 2-2 LGob Option RK(400W) Series Rear panel ③ ① ② ① CO-Optical fiber cable connector (IN) ② CO-Optical fiber cable connector (OUT) ③ UNIT number setting switch RK(800W) Series Rear panel RK(1200W) Series Rear panel ③ ③...
  • Page 11: 2-3 Lus1 Option

    2 Exterior view diagram 2-3 LUs1 Option RK(400W) Series Rear panel ① ① USB connector (Type B) RK(800W) Series Rear panel RK(1200W) Series Rear panel ① ① ① REK Series Rear panel REK Series Rear panel ① REKJ Series Rear panel...
  • Page 12: 2-4 Let Option

    2 Exterior view diagram 2-4 LEt Option RK(400W) Series Rear panel ① ① LAN connector (RJ-45) RK(800W) Series Rear panel RK(1200W) Series Rear panel ① ① ① REK Series Rear panel ① REKJ Series Rear panel...
  • Page 13: 2-5 Lmi Option

    2 Exterior view diagram 2-5 LMi Option ① CO-M cable connector (OUT) ② CO-M cable connector (IN) ③ LAN connector (RJ-45) ④ USB connector (Type B) ⑤ RS-485 cable connector ① ② (FK-MC 0,5/5-ST-2,5 : Phoenix contact) REK Series Rear panel ④...
  • Page 14: 3 Connection Diagram

    3 Connection diagram 3 Connection diagram 3-1 RK(400W/800W/1200W)/REK/REKJ Series (Standard Digital Interface), CO-MET2-25,CO-MET2-9,CO-MET4-25 CO-MET2-25 RK(400W) Series Rear panel CO-MET2-9 CO-MET4-25 RS-232C Controller/ RS-485 Controller AC Adapter Only at CO-MET4-25 CO-M Cable Up to 16 units can be connected RK(400W) Series Rear panel NOTE ・...
  • Page 15: 3-2 Rk(400W/800W/1200W)/Rek/Rekj Series (Standard Digital Interface), Co-G32M

    3 Connection diagram 3-2 RK(400W/800W/1200W)/REK/REKJ Series (Standard Digital Interface), CO-G32m CO-G32m Rear panel GPIB Cable GPIB Controller CO-M Cable RK(400W) Series Rear panel Up to16 units can be connected NOTE ・ For remote control of standard digital interface, set the Master/Slave function “M_S”...
  • Page 16 3 Connection diagram 3-3 RK(400W/800W/1200W)/REK/REKJ Series (LGob Option), CO-OPT2-25/CO-OPT2-9/CO-OPT4-25 CO-OPT2-25 CO-OPT2-9 CO-OPT4-25 CO-Optical fiber cable RK(400W) Series Rear panel (LGob Option) RS-232C Controller/ RS-485 Controller AC Adapter CO-Optical fiber cable Up to 32 units can be connected RK(400W) Series Rear panel (LGob Option) NOTE ・...
  • Page 17: 3-4 Rk(400W/800W/1200W)/Rek/Rekj Series (Lgob Option), Co-G32

    3 Connection diagram 3-4 RK(400W/800W/1200W)/REK/REKJ Series (LGob Option), CO-G32 GPIB Cable CO-G32 Rear panel GPIB Controller RK(400W) Series Rear panel (LGob Option) CO-Optical fiber cable Up to 32 units can be connected RK(400W) Series Rear panel (LGob Option) NOTE ・ Place a cap on the optical fiber cable connector not in use.
  • Page 18: Rk(400W/800W/1200W)/Rek/Rekj Series (Lgob Option), Co-U32

    3 Connection diagram 3-5 RK(400W/800W/1200W)/REK/REKJ Series (LGob Option), CO-U32 USB Cable CO-U32 Rear panel USB Controller RK(400W) Series Rear panel (LGob Option) CO-Optical fiber cable Up to 32 units can be connected RK(400W) Series Rear panel (LGob Option) NOTE ・ Place a cap on the optical fiber cable connector not in use.
  • Page 19: 3-6 Rk(400W/800W/1200W)/Rek/Rekj Series (Lus1 Option)

    3 Connection diagram 3-6 RK(400W/800W/1200W)/REK/REKJ Series (LUs1 Option) RK(400W) Series Rear panel (LUs1 Option) USB Cable USB Controller...
  • Page 20: 3-7 Rk(400W/800W/1200W)/Rek/Rekj Series (Standard Digital Interface), Co-U32M

    3 Connection diagram 3-7 RK(400W/800W/1200W)/REK/REKJ Series (Standard Digital Interface), CO-U32m CO-U32m Rear panel USB Cable USB Controller CO-M Cable RK(400W) Series Rear panel Up to 16 units can be connected NOTE ・ For remote control of standard digital interface, set the Master/Slave function “M_S”...
  • Page 21: 3-8 Rk(400W/800W/1200W)/Rek/Rekj Series (Standard Digital Interface), Co-E32M

    3 Connection diagram 3-8 RK(400W/800W/1200W)/REK/REKJ Series (Standard Digital Interface), CO-E32m CO-E32m Rear panel LAN Cable LAN Controller CO-M Cable RK(400W) Series Rear panel Up to 16 units can be connected NOTE ・ For remote control of standard digital interface, set the Master/Slave function “M_S”...
  • Page 22: 3-9 Rk(400W/800W/1200W)/Rek/Rekj Series (Let Option)

    3 Connection diagram 3-9 RK(400W/800W/1200W)/REK/REKJ Series (LEt Option) RK(400W) Series Rear panel (LEt Option) LAN Cable LAN Controller...
  • Page 23: 3-10 Rk(400W/800W/1200W)/Rek/Rekj Series (Lgob Option), Co-E32

    3 Connection diagram 3-10 RK(400W/800W/1200W)/REK/REKJ Series (LGob Option), CO-E32 LAN Cable CO-E32 Rear panel LAN Controller RK(400W) Series Rear panel CO-Optical fiber cable Up to 32 units can be connected NOTE ・ For remote control of standard digital interface, set the Master/Slave function “M_S”...
  • Page 24: 4 Functions

    4 Functions 4 Functions 4-1 Summary ① Program output voltage and current ② Program output ON/OFF ③ Measuring output voltage and current ④ Setting of delay trigger(ON delay/OFF delay individually,0.0 to 99.9sec) ⑤ Control of up to 16 units (32 units by LGob option) with one GPIB address ⑥...
  • Page 25: 4-4 Co-M Cable Connector Interface Terminal Details (Standard Digital Interface)

    RK(400W/800W/1200W)/REK/REKJ series uses 3 signals of TxD, RxD and GND of RS-232C signal for external interface control of digital communication. Using Matsusada [CO-MET2-25 / CO-MET2-9 / CO-MET4-25 / CO-G32m / CO-U32m / CO-E32m], connect them properly to controller (such as...
  • Page 26: 4-5 Settings Address And Delimiter For Gpib(Co-G32/Co-G32M)

    4 Functions 4-5 Settings address and delimiter for GPIB(CO-G32/CO-G32m) On the rear panel of CO-G32/CO-G32m there is an eight DIL switch labeled "ADDRESS". The desired address is set with this DIL switch from S1 to S5 in the binary format. (S1 is LSB.) "ON" (turn to left or up) stands for logic 1.The address is valid for the Listener and the Talker function.
  • Page 27: 4-6 Usb Setting(Co-U32/Co-U32M/Lus1 Option)

    4 Functions 4-6 USB Setting(CO-U32/CO-U32m/LUs1 Option) USB Driver Install is Refer to CO-U32/CO-U32m/LUs1 option USB driver install guide. Delimiter is CR(0D ) fixed. * When -LUs1 / -LGob / -LEt optional models which do no function-settings switch on the rear panel are communicated to an external controller or PC, it needs to set “Int.
  • Page 28: 4-8 Settings Unit Number And Upper Connection(Lgob Option)

    4 Functions 4-8 Settings unit number and upper connection(LGob Option) On the rear panel of RK(400W/800W/1200W)/REK/REKJ Series –LGob option there is an eight DIL switch labeled "UNIT". The desired unit number is set with this DIL switch from S1 to S5 in the binary format.
  • Page 29: 4-9 Settings Of Co-Met2-25/Co-Met2-9 (Standard Digital Interface)

    4 Functions 4-9 Settings of CO-MET2-25/CO-MET2-9 (Standard Digital Interface) CO-MET2-25/CO-MET2-9 uses 3 RS-232C signals of TxD, RxD and GND for communication. Referring to the following diagram, properly connect the CO-MET2-25/CO-MET2-9 with controller to be used(e.g. PC). Pin 4 - 5 and 6 - 20 are tied together inside.
  • Page 30: 4-10 Settings Of Co-Opt2-25/Co-Opt2-9 (Lgob Option)

    4 Functions 4-10 Settings of CO-OPT2-25/CO-OPT2-9 (LGob Option) CO-OPT2-25/CO-OPT2-9 uses 3 RS-232C signals of TxD, RxD and GND is used for communication. Referring to the following sketches, properly connect the RS-232C module with controller(e.g. PC). Pin 4 – 5 and 6 - 20 are tied together inside.
  • Page 31: 4-11 Settings Of Co-Met4-25/Co-Opt4-25

    4 Functions 4-11 Settings of CO-MET4-25/CO-OPT4-25 CO-MET4-25/CO-OPT4-25 uses 5 RS-485 signals of TxD+, TxD-, RxD+, RxD- and GND are used for communication. Referring to the following sketches, properly connect the Metal / Optical RS-485 module with controller(e.g. PC). Pin 4 and 5, 8 and 20 are tied together inside. Pin # Data direction TxD+ (output)
  • Page 32: 5 Program

    5 Program 5 Program 5-1 Summary of Syntax For example, following programming set the output voltage of the unit to rated maximum voltage. ① Delimiter ② Parameter ③ Command ④ Unit number ① Input delimiter. ・ GPIB connection GPIB delimiter (See Section “4-5...
  • Page 33: 5-3 Character Set For The Command

    5 Program 5-3 Character set for the command ・ Do not use the characters(codes) of section in the following ASICII code table. ・ Use the LF (0A ) and CR (0D ) only for delimiter. ・ Command string is not case sensitive. ・...
  • Page 34: 6 Getting Started

    6 Getting started 6 Getting started 6-1 CO-MET2-25/CO-MET2-9/CO-MET4-25, Standard Digital Interface Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-MET2-25/CO-MET2-9/CO-MET4-25 via RS-232C/RS-485 CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ①...
  • Page 35: 6-2 Co-G32M, Standard Digital Interface

    6 Getting started 6-2 CO-G32m, Standard Digital Interface Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-G32m via GPIB CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set GPIB address and delimiter Set GPIB address and delimiter with Address setting switch on rear panel of CO-G32m.
  • Page 36: 6-3 Co-U32M, Standard Digital Interface

    6 Getting started 6-3 CO-U32m, Standard Digital Interface Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-U32m via USB. CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set unit number Set the UNIT number to “0”.
  • Page 37: 6-4 Co-E32M, Standard Digital Interface

    6 Getting started 6-4 CO-E32m, Standard Digital Interface Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-E32m via LAN. CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set IP address Set IP address.
  • Page 38: 6-5 Co-Opt2-25/Co-Opt2-9/Co-Opt4-25, Lgob Option

    6 Getting started 6-5 CO-OPT2-25/CO-OPT2-9/CO-OPT4-25, LGob option Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected with CO-OPT2-25/CO-OPT2-9/CO-OPT4-25 via RS-232C/RS-485 CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set unit number and Upper connection Set the UNIT number to “0”.
  • Page 39: 6-6 Co-G32, Lgob Option

    6 Getting started 6-6 CO-G32, LGob Option Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-G32 via GPIB CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set GPIB address and delimiter With the switch labeled ADDRESS on the rear of CO-G32, set GPIB address and delimiter.
  • Page 40: 6-7 Co-U32, Lgob Option

    6 Getting started 6-7 CO-U32, LGob Option Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-U32 via USB CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set unit number and Upper connection Set the UNIT number to “0”.
  • Page 41: 6-8 Co-E32, Lgob Option

    6 Getting started 6-8 CO-E32, LGob Option Control a RK(400W/800W/1200W)/REK/REKJ series power supply connected to CO-E32 via LAN. CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set IP address Set IP address.
  • Page 42: 6-9 Lus1 Option

    6 Getting started 6-9 LUs1 option Control a RK(400W/800W/1200W)/REK/REKJ series power supply via USB CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Connect RK(400W/800W/1200W)/REK/REKJ series power supply to USB controller Connect RK(400W/800W/1200W)/REK/REKJ series power supply to USB controller(e.g.
  • Page 43: 6-10 Let Option

    6 Getting started 6-10 LEt option Control a RK(400W/800W/1200W)/REK/REKJ series power supply via LAN CAUTION ・Voltage is output actually. ・Do not connect any load to power supply before this procedure is completed. ① Set IP address Set IP address. See section “8–LEt option”. ②...
  • Page 44: 7 Command Reference

    7 Command reference 7 Command reference 7-1 Command list table 2 Command list Mode Command Function page Write Output Set output voltage(HEX mode) Set output current(HEX mode) Set over voltage protection (HEX mode) Set over current protection (HEX mode) Set output voltage (percent mode) Set output current (percent mode) Set over voltage protection (percent mode) Set over current protection (percent mode)
  • Page 45: 7-2 Reference

    7 Command reference 7-2 Reference CH0 Command This command programs output voltage of power supply with hexadecimal format. ① CH0 FFFF (Syntax) A maximum of rated output voltage ② CH0 7FFF A half of rated output voltage ③ CH0 F0 Same as “CH0 00F0”...
  • Page 46 7 Command reference CH2 Command This command programs over voltage protection with 00 to FF (8bit) Maximum over voltage protection value = maximum rated voltage x 110% ① CH2 FF (Syntax) (Over voltage protection value) = (maximum over voltage protection value) ②...
  • Page 47 7 Command reference VCN Command This command programs output voltage of power supply with percentage of the rated. (increment of 0.01%) ① VCN 100 (Syntax) A maximum of rated output voltage ② VCN 12.34 12.34% of rated output voltage ③ VCN 123.4 Output voltage is not changed ④...
  • Page 48 7 Command reference OVP Command This command programs over voltage of power supply with percentage of the rated. (increment of 0.1%) Maximum over voltage protection value = maximum rated voltage x 110% ① OVP 100 (Syntax) A maximum of rated over voltage ②...
  • Page 49 7 Command reference VSET Command This command programs output voltage with 0.0 to rated voltage(V) (Syntax) In case of range 20V/20A(increment of 0.01V) ① VSET 20 (output voltage) = (20V) ② VSET 12.34 (output voltage) = (12.34V) ③ VSET 123.4 output voltage does not change ④...
  • Page 50 7 Command reference OVPSET Command This command programs over voltage protection valuet with 0.0 to rated over voltage protection setting value.(increment of 0.01V) Maximum over voltage protection value = Maximum rated voltage x 110% (Syntax) In case of range 20V/20A ①...
  • Page 51 7 Command reference SW Command This command programs output ON/OFF. ① SW0 (Syntax) Disable the output ② SW1 Enable the output (Default) (Description) In case the power supply has blackout protection, this command might not enable to output. Refer to the instruction manual of power supply for details of how to reset blackout protection.
  • Page 52 7 Command reference DELAY Command This command programs ON/OFF of delay trigger function. ① DELAY OFF (Syntax) delay trigger function OFF ② DELAY ON delay trigger function ON (Default) DELAY OFF (Description) Featuring multiple command TON Command This command programs ON delay time (0.0 to 99.9 sec) ①...
  • Page 53 7 Command reference MN1 Command This command allows receiving the output voltage monitor with 000 to FFF (12 bit) (Syntax) ① MONI1=FFFH (Return) (Monitor value) = (maximum rated voltage) ② MONI1=7FFH (Monitor value) = (half of maximum rated voltage) MN2 Command This command allows receiving the output current monitor with 000 to FFF (12 bit).
  • Page 54 7 Command reference STS Command This command allows to receiving the character string of the power supply’s output status and setting status. (Syntax) (Return) #( UNIT number ) (status) Output Control Mode Error The number of 0 to 31 (Only at error) Over voltage protection Output cut off...
  • Page 55 7 Command reference CH0? Command This command allows receiving the setting value of output voltage with hexadecimal format. (Syntax) CH0? ① CH0=FFFFH (Return) Output voltage is set to a maximum of the rated ② CH0=7FFFH Output voltage is set to a half of the rated CH1? Command This command allows receiving the setting value of output current with hexadecimal format.
  • Page 56 7 Command reference VCN? Command This command allows receiving the setting value of output voltage with 0.0 to 100.0% ( increment of 0.01%) (Syntax) VCN? ① VCN=100.0 (Return) Output voltage is set to a maximum rated voltage ② VCN=12.34 Output voltage is set to 12.34% of maximum rated voltage ③...
  • Page 57 7 Command reference VSET? Command This command allows receiving the setting value of output voltage with 0.0 to rated voltage (increment of 0.01V) (Syntax) VSET? (in case of 20V/20A) ① VSET=20.0 (Return) Set to 20.0V ② VSET=12.34 Set to 12.34V ③...
  • Page 58 7 Command reference SW? Command This command allows receiving the setting output status with 0 or 1(OFF/ON) (Syntax) ① SW0 (Return) Disable the output ② SW1 Enable the output DELAY? Command This command allows receiving the status of delay trigger function. (Syntax) DELAY? ①...
  • Page 59: 7-3 Minimum Setting / Return Value List

    7 Command reference 7-3 Minimum setting / return value list Minimum setting / return value for each command RK(400W/800W/1200W)/REK/REKJ Command increment Series Model VSET, Models below 10V 0.001V VSET?, Over 10V 0.01V VGET, Below 100V OVPSET, Models over 100V 0.1V OVPSET? Models over 100A 0.1A...
  • Page 60: 8 -Let Option

    8 – LEt option 8 –LEt option 8-1 Summary -LEt option corresponds to a digital communication interface, LAN. Therefore it enables to locate power supply on the network and to control the power supply without preparing adapter module. 8-2 LAN connector Please connect with RJ-45 (10BASE-T, 100BASE-T).
  • Page 61: 8-5 Connection Example Of -Let Option For Rk(400/800/1200)/Rek/Rekj Series

    8 – LEt option 8-5 Connection example of –LEt option for RK(400/800/1200)/REK/REKJ series RK(400W) Series Rear panel LAN or WAN Network LAN cable...
  • Page 62: 8-6 Network Address Setting

    8 – LEt option 8-6 Network address setting The network setting of –LEt option is set on start menu. Please hold down the SET switch during Version is displayed at the power switch “ON” and indication on the display shall be switched “dly”. REMOTE REMOTE Press and hold down...
  • Page 63 8 – LEt option 2-1. IP address setting IP address can be set while it displays “IP” on the front panel. By turning the voltage setting dial, the IP address number can be set. IP 1 IP 2 IP 3 IP 4 Default 192.
  • Page 64 8 – LEt option 2-2. Subnet mask setting Subnet mask can be set while it displays “Sub” on the front panel. By turning the voltage setting dial, the mask number can be set. Sub1 Sub2 Sub3 Sub4 Defalut 255. 255. 255.
  • Page 65 8 – LEt option 2-3. Default gateway address setting Default gateway address can be set while it displays “Gat” on the front panel. By turning the voltage setting dial, the address number can be set. Gat1 Gat2 Gat3 Gat4 Defalut 000.
  • Page 66 8 – LEt option LOCK switch (press and hold down): Set network address will be registered on power supply itself. (*Restarting of the power supply is required to effect registered setting. Setting will be reflected when the power supply is turned on next time) After registered, next time power supplies are turnedon, the registered...
  • Page 67: 8-7 Vb Sample Program

    8 – LEt option 8-7 VB sample program Here below is sample program Visual basic. We hope you find it informative. Form1 Text1 Label3 Label5 Command1 Command2 Winsock1 Dim strReadBuffer As String Private Sub Form_Load() ‘Form load Winsock1.LocalPort = 0 ‘Change local port setting to 0 Winsock1.RemoteHost = "192.168.10.1"...
  • Page 68 8 – LEt option Private Sub Command2_Click() ‘When Command1button clicked Dim rdata As String Dim I As Long On Error GoTo ErrorHandler Label3.Caption = "" Label5.Caption = "" rdata = "" For I = 0 To 30000 rdata = rdata & strReadBuffer strReadBuffer = ""...
  • Page 69: 8-8 Vc Sample Program

    8 – LEt option 8-8 VC sample program Example of WinSock of Win32API Link “wsock32.lib” Include “winsock.h” //Process at formatting //prepare socket soc = socket(PF_INET, SOCK_STREAM, 0); if (soc == INVALID_SOCKET) { //socket preparation error //connection process unsigned long serveradd; struct sockaddr_in sockaddr;...
  • Page 70 8 – LEt option // Receive process // Time out check fd_set fdset; timeval timeout; int res; timeout.tv_sec = 0; timeout.tv_usec = 2000; // Set time out time as 2sec FD_ZERO( &fdset ); FD_SET(sock, &fdset); res = select(2, &fdset, NULL ,NULL , &timeout); if (res == 0) { // Time out error return;...
  • Page 71 8 – LEt option...
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