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U90 Ladder Software Manual
376
modem) and the Data Terminal Equipment
(DTE; the controller or PC). The arrows
below show the direction of data flow.
Note
Unitronics’ controllers do not
support the control lines. This is
why the DTE side of the table
comprises only 3 pins.
Note Since the DSR can be
permanently set to ON,
connecting it to the RTS causes
the terminal always be ready to
transmit\receive data.
M90 modem communication problems
If your M90 is transferring data via modem, you can begin troubleshooting by entering
Information Mode. You can then check the status of relevant System Bits and Integers to
help diagnose the problem.
To begin diagnosing the problem, check the error code contained in SI 70. Refer to the
error code table in How the M90 works with a modem.
The tables below show the more common causes of modem communication problems.
Problem SI 70 value Possible Cause & Recommended Action
Modem fails to
initialize
2: Modem Did
Not Reply
M90-to-modem cable:
Make sure that the cable is securely connected.
Check the M90 modem connection and pin-out of the
M90-to-modem adapter cables. Note that if you use
cables comprising this pin-out, you must set the
RS232 parameter Flow Control to N (none).
Incompatible communication settings.
Most modems automatically match the parameters of
incoming data: baud rate, data bits, parity & stop
bits. The M90's embedded modem settings are:
9600, 8 data bits, no parity, 1 stop bit. You may
need to manually change your modem's
communication settings to match these via
Hyperterminal.
0: No Error SB 72 OFF:
In order to work with a modem, you must select 'Use
modem' in the M90 Modem Configuration box . This
causes SB 72 Initialize Modem to turn ON when the
M90 powers up.
Note that if the M90 has also been configured to use
SMS messaging, that the M90 will not be able to
connect to a modem because the SMS feature
overrides the modem.
Check too, that SB 72 is not disabled in your
program.
6: Modem Report
Error
Check the modem initialization commands. Refer to
Configuring the M90 to use a modem.
Other problems:
Problem Possible cause Recommended action
Modem is busy Modem is
engaged,
or is being
initialized
Check that the modem is free.
Use the SBs: Modem Initialization Status listed above to
check the COM port status; communications cannot flow
through the port during initialization. For more
information check the topic How the M90 works with a
modem.
Handshake Modem Check the PLC-to-modem connection and pin-out,
- U90 Ladder Software Manual 1
- Table Of Contents 3
- Welcome to U90 Ladder 9
- Printing Documentation 10
- Interface Language 10
- Getting Started 11
- Uploading a Project 12
- Project Properties 13
- Ladder Editor 17
- Using the HMI Display Editor 17
- Comments Tool 18
- Power-up 19
- Hardware Configuration 21
- Configuring an Analog Input 38
- Analog I/O Ranges 43
- High-Speed Output: PWM 49
- Display 55
- Variable 75
- Changing Mode via Ladder 96
- Dialing a remote M90 99
- Communication Log 100
- M90 modem configuration 106
- Modems: General 109
- Communications 111
- Networks 112
- Creating SMS text messages 120
- Attaching variables 120
- Deleting variables 121
- Testing messages 121
- Variable Types 122
- ACK-Acknowledge message 123
- Problem SI 180 133
- Ladder Net 135
- Placing Contacts & Coils 136
- Placing a Function Block 138
- Ladder Logic 140
- Comments 140
- Copy and Paste Elements 142
- Copying multiple nets 143
- Moving Elements 145
- Replacing Ladder elements 146
- Restoring System Symbols 148
- Scrolling between nets 149
- Intersecting lines: Junction 153
- Ladder Nets with Feedbacks 153
- Elements 154
- Operands 161
- Functions 175
- Equal 177
- Greater or Equal 177
- Greater Than 178
- Less or Equal 178
- Less Than 179
- Not Equal 179
- Using the Compare function 180
- AND Example 183
- Add Examples 189
- Divide 190
- Division Examples 191
- Multiply 193
- Multiplication Examples 194
- Subtract 195
- Subtraction Examples 195
- Store Direct function 197
- Store Indirect function 199
- Clock Functions 200
- Direct Clock function 201
- Indirect Clock function 206
- Linearization 214
- Load Indirect 217
- Copy Vector 218
- Fill Vector 219
- Function Number 220
- (SI 140) 220
- Description 220
- 30 Fill MI Vector 220
- 31 Fill DB Vector 220
- Square Root 223
- Communication Utilities 226
- Interrupt 228
- Example 229
- Convert MB to MI, MI to MB 230
- Shift Register 233
- Counter 236
- Proportional Band 242
- Integral Action 243
- Derivative Action 244
- PID Function Parameters 245
- Utilities 249
- Verify Project 251
- M90 Downloader 252
- Battery Back-up values 253
- Find and Replace Elements 254
- Program Password Protection 255
- Examples 264
- General 269
- HSC Types & Functions 293
- To Create a Field 306
- To Attach a Variable 307
- Writing Values 356
- Reading Values 356
- Linearize values for Display 358
- Phone Book 373
- Modem commands 380
- Modem Connections 381
- GSM modems 385
- Modem Commands 393
- Troubleshooting 399
- CANbus network problems 402
- M90 does not turn on 402
- Power-up Modes 403
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