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FAQ Category: Communication

My EXM CPU Won’t Send More Than One SMS – Why?

If you need to send a SMS to multiple phone numbers, you must ensure the trigger to the SMS message block is enable for at least 10-seconds per number. So if you have two numbers that need to receive the SMS, then the trigger MUST be On for at least 10-seconds. For three numbers, then […]

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Why Won’t my Ethernet CPU communicate with the Software?

Before using any of our Ethernet CPU’s we advise using our Device Manager software to configure them for your needs. The Ethernet CPU can act as either a Server (Slave) or Client (Master) and needs setting to how you wish it to behave. Other issues that may cause communication problems are: – Not using an […]

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Emails Are Not Being Sent by the EXM CPU. Why?

The most likely cause of this is that the email server (SMTP) you are trying to use requires SSL. EXM CPU’s do not support SSL so please choose an email server that does not require it.

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How Many SMS Messages Can be Stored in EXM CPU?

A total of 64 input and output SMS messages can be stored.

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Do All Software Blocks Have a Modbus Address?

No, not all blocks have a direct Modbus address. For example On-Delay Timer setting does not have a direct address. However, you can use another reference block in your program to store the timer setting such as an AF or Counter block, which do have direct Modbus addresses.

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Can CPU Act as a Modbus Master and Slave at the Same Time?

Yes, the CPU can act as both a Modbus Master and Slave at the same time. For example you may connect the CPU via RS232 programming lead to one of our HMI’s, and set it to act as a Modbus RTU Slave. At the same time, you could have an RS485 expansion module attached to […]

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Can the CPU be a Modbus Master?

Yes, by use of the Modbus Read and Modbus Write blocks in the programming software.

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Do the CPU’s Support Modbus Protocol?

Yes, all the CPU’s in our range support Modbus RTU protocol as standard. Ethernet CPU’s also support Modbus/TCP protocol.

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My PC Software Can’t Communicate with the CPU When Using USB Cable. Why?

There are a number of things that would cause this issue. If it’s the first time you have used your USB cable with the PC, please ensure you have the correct USB driver installed. Use your PC’s Device Manager and you should see something like this: If not download the driver from our Download section […]

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