Yokogawa Touch Screen GP20 User Manual Page 13
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1-7
IM 04L51B01-17EN
Using Dedicated Commands (General)
1
2
App
• Four-wire system
Generally, a four-wire system is used to connect to a host device. In the case of a four-
wire system, the transmission and reception lines need to be crossed over.
Terminator (external) 120 Ω 1/2W or greater
#1
Do not connect terminators to #1 through #n-1.
RS-422/485
terminal on the GX/GP
#2 #n
(#n 32)
Terminator (external)
Host device
side
SG
RDB( + )
RDA( – )
SDB( + )
SDA( – )
FG
SG
RDB+
RDA–
SDB+
SDA–
(SG)
(RDB
+)
(RDA
–)
(SDB
+)
(SDA
–)
FG
SG
RDB+
RDA–
SDB+
SDA–
(SG)
(RDB
+)
(RDA
–)
(SDB
+)
(SDA
–)
FG
SG
RDB+
RDA–
SDB+
SDA–
(SG)
(RDB
+)
(RDA
–)
(SDB
+)
(SDA
–)
• Two-wire system
Connect the transmission and reception signals with the same polarity on the RS-422/485
terminal block. Only two wires are used to connect to the external device.
Terminator (external) 120 Ω 1/2W or greater
#1
Do not connect terminators to #1 through #n-1.
RS-422/485
terminal on the GX/GP
#2 #n
(#n 31)
Terminator (external)
Host device
SG
RDB( + )
RDA( – )
SDB( + )
SDA( – )
FG
SG
RDB+
RDA–
SDB+
SDA–
(SG)
(B+)
(A
–)
(B+)
(A
–)
FG
SG
RDB+
RDA–
SDB+
SDA–
(SG)
FG
SG
RDB+
RDA–
SDB+
SDA–
(SG)
(B+)
(A
–)
Note
• The method used to eliminate noise varies depending on the situation. In the connection
example, the shield of the cable is connected only to the GX/GP’s ground (one-sided
grounding). This is effective when there is a difference in the electric potential between
the computer’s ground and the GX/GP’s ground. This may be the case for long distance
communications. If there is no difference in the electric potential between the computer’s ground
and the GX/GP’s ground, the method of connecting the shield also to the computer’s ground
may be effective (two-sided grounding). In addition, in some cases, using two-sided grounding
with a capacitor connected in series on one side is effective. Consider these possibilities to
eliminate noise.
• When using the two-wire interface (Modbus protocol), the 485 driver must be set to high
impedance within 3.5 characters after the last data byte is sent by the host computer.
1.2 Operations over the Serial Interface
- Paperless Recorder 1
- Communication Command 1
- User’s Manual 1
- Introduction 3
- Trademarks 3
- Revisions 3
- How to Use This Manual 4
- Contents 5
- • Signal direction 9
- • Connection example 9
- IM 04L51B01-17EN 10
- • CS-RS 11
- Data transmission control 11
- Data reception control 11
- Connection 12
- • Connecting the Cable 12
- • Signal names 12
- Connecting to the host device 12
- • Four-wire system 13
- • Two-wire system 13
- Serial interface converter 14
- Terminator 14
- 2.1.1 General Communication 15
- 2.1.3 Command Syntax 15
- A Single Command 15
- Command Names 16
- Parameters 17
- Delimiters 17
- Sub delimiters 17
- Terminators 17
- 2.1.4 GX/GP Responses 18
- 2.2 List of Commands 19
- 2.2.2 Output Commands 20
- 2.2.3 Operation Commands 20
- 2.3 Parameters 22
- 2.4 Setting Commands 23
- SRangeAI 27
- SRangeDI 28
- SRangeDO 28
- DO Channel Operation 28
- SMathBasic 33
- Math Action (/MT) 33
- SMatchTimer 41
- Match Time Timer 41
- SEventAct 41
- Event Action 41
- Report Type (/MT) 42
- SRepData 42
- Report Data (/MT) 42
- 2.5 Output Commands 58
- 2.6 Operation 61
- Commands 61
- 2.7 Communication 65
- Control Commands 65
- 2.8 Instrument Information 66
- Output Commands 66
- 2.9 Responses to Commands 67
- 2.9.3 Data Output Response 68
- ASCII Output 68
- Binary Output 69
- Data Block 70
- 2.10 ASCII Output Format 71
- 2.10.7 GX status (FStat) 77
- 2.10.8 Alarm Summary (FLog) 78
- 2.10.10 Event log (FLog) 80
- 2.10.11 Error Log (FLog) 81
- 2.10.18 Web Log (FLog) 88
- 2.10.21 Setting Data (FCnf) 90
- Output Example 92
- Information (_TYP) 94
- Reserved Channel number 98
- 6 bits 10 bits 98
- Configuration 100
- Characters Used in Commands 103
- Appendix 2 Login Procedure 104
- Appendix 105
- Appendix 2 Login Procedure 105
- Medium Files and File Lists 106
- Overview of the FIFO Buffer 108
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