43-TV-25-30 Iss.6 GLO Aug 07 UK 305
Modbus Function Codes
These are described in document ModbusSerial Communications User manual, 51-52-
25-66P, 4/06.
Pages 14 to 25, inclusive. For X Series recorders only use codes 01, 02, 03/04, 16 and
17.
Supplemental to Function code 16 with standard address 0004 can be used to send.
Supplemental to Function code 17, Report Device ID:
• Page 23 - Slave ID for X Series recorders is always 05.
• Page 24 - Device description
• Page 25 - Number of data block records, byte 23, always equals 05 for the
Trendview range. data blocks are always in order.
00 = Analogue inputs, 02 = Digital inputs, 03 = Digital outputs, 06 = Pens, 09 =
Totalisers.
Item Size in bytes Contents
Device Description 16d, 0x10 Recorder type+space+software version
The length is extended to exactly 16 bytes by trailing
0x00 characters.
Recorder type = is a combination of the OEM series
name followed by the OEM device name (truncated to
16 characters)
Software version is of the form nn.XX eg.00.FQ
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