Perle Systems Switch DS1 Manuel d'utilisateur télécharger pdf (Page 176)

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Accessing I/O Data Via TruePort

Successful Response Format

Byte(s) # of Bytes Value

1 1 Command code (from request).

2 2 Starting register number (see A4/T4 Registers , A4D2/A4R2 Registers ,

or D4/D2R2 Registers for this value) from request.

4 2 Number of registers written.

Unsuccessful Response Format

Byte(s) # of Bytes Value

1 1 Command that this is a response to. If an error has been detected, the

command value will have the high bit set (OR with 0x80). For

example: The Command is 0x10, so the command field in the response

would be 0x90.

1 1 Error code, see Error Codes .

Example 1: Turn on the first relay on a D2R2 unit.

The first relay (R1) is a digital out coil register with a decimal value of 6659 (hex 0x1A03).

Request: 0x0F 0x1A 0x03 0x00 0x01 0x01 0x01

Response: 0x0F 0x1A 0x03 0x00 0x01

Example 2: Turn on the first and second relay on a D2R2 unit.

The first relay (R1) is a digital out coil register with a decimal value of 6659 (hex 0x1A03).

Request: 0x0F 0x1A 0x03 0x00 0x02 0x01 0x03 (03 = “00000011” which sets R1 and R2 to 1)

Response: 0x0F 0x1A 0x03 0x00 0x02

Note:

When reading or writing consecutive “Boolean” (coils) registers, the values of the registers

are combined into a single byte as shown by the example above. Two registers (coils) are

being written but the length of the data is 1 byte. The one byte contains the value for both

registers as follows:

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 245 246

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Perle Systems Switch DS1 Manuel d'utilisateur Page 176