Owner manual

9 Troubleshooting

The following troubleshooting tips include some basic instructions for common problems.

9.1 Host Systems

Problem Solution

No communication with the

Gateway when using RS-485

The default communications settings for the RS-485 port are: 1 start bit, 8 data bits, no

parity, 1 stop bit, and 19.2k baud. The DX80 Gateway uses Modbus RTU protocol for all

communications. Supported Modbus function codes are 3, 6, and 16.

Verify the DX80 model supports RS-485 serial communications.

Verify the Slave ID address is set for the bus environment. Factory default Slave ID = 1.

The factory default for the Modbus timeout is set to zero (disabled). Verify the time is set

correctly.

RS-485 termination or biasing is not supplied on the Gateway and should be provided

externally to the Gateway. (Termination is not required by the Gateway, proper biasing

of the serial lines is required.)

No communication with the

Gateway when using the

DX83 Ethernet Bridge

Load a properly configured XML file into the DX83 Ethernet Bridge.

The DX83 Ethernet Bridge can be jumpered for RS-485 or RS-232 communications;

verify the jumpers are set properly. All DX80 devices are RS-485 based. Please refer to

the Jumper Configuration section.

9.2 Modbus Message Codes for Register 8

Conditions are detected as they occur and are immediately reported back to the Gateway. Once the message is sent back

to the Gateway, the Node does not resend the message until the condition changes or there is a higher priority message.

The higher the message code, the higher the priority. For more information about how Site Survey data is stored in

registers 7 and 8, refer to the Site Survey section.

The following are Modbus message codes, shown in hex, that may appear on the SureCross devices' I/O 8 Modbus

Device Register 8 (Hex)

Message

Code

[15:8]

Data Field

[7:0]

Description

00 80 Normal operation. Device message register contents 0x0080 indicates the particular

Node is synchronized to the Gateway. (Decimal value 128.) A value of zero (0)

indicates there is no device present.

01 00-FF Unknown message. The message was received correctly (correct checksum), but it is

not a recognized command. This type of message is usually caused by devices with

poor radio links or collocated networks that are not uniquely separated by binding

codes and Network IDs. This message does not affect the performance of the

network. (Decimal values 256 through 511.)