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2
Chapter
2 -1
Using the Communication Ports
This chapter describes: On page:
communication ports overview
2 -1
communication modes 2 -2
handshaking 2 -4
communication rates 2 -6
operating modes 2 -7
what’s next? 2 -13
The BASIC module has three communication ports: DH485, PRT2, and
PRT1. Through the configuration you select, you can designate at least
one of these ports to function as a program port, ASCII port, network port,
or DF1 protocol port.
DH485
PRT2
PRT1
What’s in This Chapter?
Communication Ports
Overview
- BASIC Module 1
- Allen-Bradley 1
- Important User Information 2
- EEPROM Programming Support 4
- Additional RAM Memory 4
- Five New LED Indicators 4
- Error-Trapping Support 5
- DH-485 Network Support 5
- Reset Switch Support 6
- Series B and 8
- 1746-BAS Compatibility 8
- Changes to the Manual 9
- Since the Last Printing 9
- Preface 10
- Summary of Changes 10
- Using This Manual 11
- How To Use This Manual 12
- Terms and Abbreviations 13
- Conventions 14
- Related Publications 14
- Getting Started 15
- Local Product Support 16
- Technical Product Assistance 16
- Allen-Bradley Support 16
- Table of Contents 17
- Chapter 1 17
- Chapter 2 17
- Chapter 3 17
- Chapter 4 17
- Chapter 5 18
- Chapter 6 18
- Chapter 7 18
- Chapter 8 18
- Expressions 19
- Operators 19
- Call Routines 0 - 68 21
- Call Routines 69-127 22
- Appendix A 24
- Appendix B 24
- Appendix C 24
- Appendix D 24
- Appendix E 24
- Installing the BASIC Module 25
- (Cat. No. 1771-DB) 26
- Configure the Jumpers 27
- Determine BASIC Module 34
- Placement 34
- Key the Backplane Connector 35
- Install the Module into the 36
- 1771 I/O Chassis 36
- Peripheral Devices 37
- Power up the Module 37
- Reset the Module 37
- Read the Indicator Lights 38
- Using the Communication Ports 39
- Communication 40
- DH485 Port 41
- Handshaking 42
- Hardware Handshaking 43
- Communication Rates 44
- Operating 45
- ASCII Port 46
- Program Port 47
- DF1 Protocol 48
- Network Port 49
- Chapter 53
- Remove the BASIC Module 54
- Disassemble the BASIC 55
- Install Optional Memory 56
- Install the Battery 60
- Screwdriver Slots 61
- Reassemble the BASIC 63
- Programming the BASIC Module 65
- Create a Program 66
- ASCII Terminal Emulator 67
- Number Program Lines 70
- Firmware Revision: A 71
- All rights reserved 71
- Programming Block-Transfers 75
- Output Image Table 76
- Data Tables 76
- Input Image Table 77
- Block-Transfer Buffers 78
- Block-Transfers and the 79
- Programming Block-T 80
- Family Processors 82
- Ladder Logic 82
- Asynchronous Block Transfer 84
- Synchronous Block Transfer 85
- Edit a Program Line 87
- Delete a Program Line 89
- Renumber a Program 89
- Debug a Program 90
- Using BASIC Module Statements 91
- Port Communication Calls 92
- Block-Transfer Support 93
- Number Conversion Calls 94
- Clock/Calendar Calls 94
- DH-485 Communication 95
- Background Operations 96
- Execution Control and 97
- Interrupt Support Calls 97
- Setup Calls 99
- What’s Next? 100
- Data Types 101
- String Data Types 102
- Numeric Data Types 103
- Backplane Conversion 104
- 16-Bit Binary (4 Hex Digits) 105
- 4-Digit, Signed, Octal 106
- What’s in This Chapter? 111
- Relational Expressions 111
- Constants 111
- Variables 112
- G arithmetic G functional 113
- G logical G logarithmic 113
- G relational G string 113
- Order of Operations 113
- Negation ( – ) 116
- Arithmetic Errors 116
- Bitwise Operators 117
- Relational Operators 119
- : 1.2626272 121
- Functional Operators 121
- Logarithmic Operators 123
- String Operators 124
- # and @ 127
- Special Function Operators 127
- Commands 131
- Backspace 137
- Examples 146
- Line Calls 152
- Statements 153
- rel expr 160
- DO-WHILE 161
- FOR-TO-(STEP)-NEXT 163
- IF-THEN-ELSE 167
- ON-GOSUB 176
- PH0. and PH1 179
- Call Routines 0 – 68 191
- CALL 0: Reset Module 192
- CALL 1: No Operation 192
- CALL 2: Timed Block 192
- Transfer-Read Buffer 192
- CALL 3: Timed Block 193
- Transfer-Write Buffer 193
- CALL 4: Set Block 194
- Transfer-Write Length 194
- CALL 5: Set Block 194
- Transfer-Read Length 194
- CALL 6: Block-Transfer 195
- Write Buffer 195
- CALL 7: Block-Transfer 195
- Read Buffer 195
- Input and Output Arguments 196
- Call Routines 0–68 197
- SLC 16-Bit Unsigned Integer 199
- 16: Enable/Disable 200
- DF1 Packet Interrupt 200
- CALL 17: 4-Digit BCD to 201
- BASIC Floating Point 201
- CALL 18: Re-Enable Control 201
- C Break Function 201
- BASIC Floating Point to 204
- 6-Digit, Signed, Fixed 204
- Decimal BCD 204
- BASIC Floating Point to SLC 205
- 16-Bit Signed Integer 205
- BASIC Floating-Point to SLC 206
- 16-Bit Binary 206
- CALL 30: PRT2 Port 210
- Support Parameter Set 210
- CALL 31: Display PRT2 Port 211
- Parameters 211
- 32: Enable/Disable 212
- Processor Interrupt 212
- CALL 33: Transfer Data from 213
- PRT1 or PRT2 to the 213
- BTR Buffer 213
- Sample Ladder Logic 218
- 35: Retrieve Numeric 224
- Input Character from PRT2 224
- CALL 36: Get the Number of 225
- Characters in the PRT2 Port 225
- CALL 37: Clear the PRT2 225
- Port Buffers 225
- CALL 38: Expanded ONERR 226
- CALL 39 : 3.3-Digit Signed 228
- BCD to BASIC Floating 228
- 40: Set the W 229
- Clock Time (Hour, Minute 229
- Second) 229
- 43: Retrieve 231
- Date/Time String 231
- CALL 44: Retrieve Date 231
- Numeric (Day, Month, Year) 231
- CALL 49: Read Remote 234
- DH-485 SLC Data File 234
- DH-485 SLC Data 240
- CALL 52: Retrieve Date 248
- CALL 53 – 59 248
- CALL 60: String Repeat 249
- CALL 61: String Append 250
- (Concatenation) 250
- CALL 62: Number to String 251
- Conversion 251
- CALL 63: String to Number 252
- CALL 64: Find a String 253
- 65: Replace a String 254
- CALL 66: Insert String in a 255
- CALL 67: Delete String 256
- CALL 68: Determine Length 257
- Call Routines 69–127 259
- CALL 70: ROM to RAM 260
- Program T 260
- CALL 71: ROM/RAM to ROM 261
- CALL 72: RAM/ROM Return 262
- CALL 73: Battery-Backed 263
- RAM Disable 263
- CALL 74: Battery-Backed 263
- RAM Enable 263
- CALL 75 – 76 263
- CALL 77: Protected Variable 264
- CALL 78: Set Program Port 266
- Communication Rate 266
- CALL 79: Set the Active 266
- LED Blinking State (No 266
- Operation) 266
- CALL 80: Check Battery 267
- Condition 267
- CALL 81: User PROM Check 268
- 82: Check User 269
- Memory Module Map 269
- CALL 83: Display DH485 269
- Port Parameters 269
- Common Interface File to 270
- BASIC Input Buffer 270
- Output Buffer to DH-485 271
- Common Interface File 271
- CALL 86: Check DH-485 272
- Interface File Remote Write 272
- CALL 87: Check DH-485 273
- Interface File Remote Read 273
- CALL 88: BASIC Floating 274
- Point to PLC-5 Floating 274
- CALL 89: PLC-5 Floating 275
- Point to BASIC Floating 275
- CALL 90: Read Remote 276
- DH-485 Data File to BASIC 276
- Input Buffer 276
- Output Argument One 278
- Output Buffer to Remote 280
- DH-485 Data File 280
- CALL 92: Read Remote 284
- DH-485 Common Interface 284
- File to BASIC Input Buffer 284
- remote device node address 286
- message time-out value 286
- Buffer to Remote DH-485 287
- CALL 94: Display Current 290
- PRT1 Port Setup 290
- CALL 95: Get Number of 290
- Characters in PRT1 Buffers 290
- 96: Clear PRT1 291
- Receive/Transmit Buffers 291
- CALL 97: Enable Port PRT2 291
- DTR Signal 291
- CALL 98: Disable Port PRT2 292
- CALL 99: Reset Print Head 292
- CALL 103: Print PRT1 294
- Transmit Buffer and Pointer 294
- CALL 104: Print PRT1 295
- Receive Buffer and Pointer 295
- CALL 105: Reset PRT1 to 295
- Default Settings 295
- 106 – 107 296
- CALL 108: Enable DF1 296
- Driver Communications 296
- CALL 109: Print the 302
- Argument Stack 302
- 10: Print the PRT2 303
- Port Transmit Buffer and 303
- 11: Print the PRT2 304
- Port Receive Buffer and 304
- 14: Transmit DF1 306
- 15: Check DF1 307
- 16: Call User 308
- Defined Assembly Language 308
- 17: Get DF1 Packet 309
- 18: PLC/SLC 310
- Unsolicited Writes 310
- 19: Reset the PRT2 314
- Port to Default Settings 314
- CALL 120: Clear BASIC 315
- Module I/O Buffers 315
- CALL 121 315
- CALL 122: Read Remote 316
- DF1 PLC Data File 316
- 123: W 324
- 124–127 332
- Product Overview 333
- Hardware Features 334
- Software Features 335
- Diagnostic Features 336
- ASCII Terminal Interface 337
- Programming Interfaces 337
- BASIC Development Software 338
- Network Configurations 339
- Product Overview 340
- Appendix 340
- DF1 Protocol Configuration 341
- Memory Requirements 342
- Keying Clips 343
- Connector 343
- .99999999E 344
- Related Products 345
- Conversion Table 347
- Troubleshooting 349
- Error Messages from BASIC 350
- Error Messages from CALL 352
- Routines 352
- Series A Configuration Plugs 355
- Quick Reference 357
- See also BTR buffer 365
- See also BTW buffer 365
- BUSINESS REPLY MAIL 392
- Supersedes 394
- Copyright 394
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