Bender COMTRAXX CP9 Series Manual page 24

Example:
Channel 2 of the device with address 3 is to be queried. How is the start address determined for querying the
channel? In our example, the relevant cells in the table are marked bold.
1. For device address 3 the first part of the address, 0x03 (high byte), is taken from Tabelle 4.1.
2. For channel 2 the second part of the address, 0x14 (low byte), is taken from Tabelle 4.2. For the number
of words to be requested the number 4 is taken from the same table:
(0x14 to 0x17 = 0x04).
3. The start address 0x0314 is formed from the high byte and low byte.
Memory image of a device
LoBy
0 1
te
0x0 --------------------------- Device type ----------------------------
0x1 Channel 1
0x2 Channel 5
0x3 Channel 9
0x4 Channel 13
0x5 Channel 17
0x6 Channel 21
0x7 Channel 25
0x8 Channel 29
3 3 3 3
0x9
3 4 5 6
0xA R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
0xB R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
0xC0 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
0xD R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
0xE R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
0xF R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R
Abbreviations for memory contents: C = Common alarm D = Device lost (device failure) R = Reserved
A detailed description of the data formats for the device type, timestamp etc. is given below.
4.2.2.3 Device type
Wor
0x01
d
0x00
ASCII text, 10 words/20 bytes
The device type is set using a bus scan.
4.2.2.4 Timestamp
Word 0x0A
HiByte LoByte
Year
YY
The timestamp is set according to a datagram received from a transmitting device.
24
2 3 4 5
Channel 2
Channel 6
Channel 10
Channel 14
Channel 18
Channel 22
Channel 26
Channel 30
3 3 3 4 4 4 4 4
7 8 9 0 1 2 3 4
Tab. 4.2: Modbus address assignment of the channels in a device;
Hex representation: horizontal = units, vertical = sixteens
0x02 0x03 0x04 0x05
0x0B
HiByte LoByte
Month Day
MM DD
6 7 8 9
Channel 3
Channel 7
Channel 11
Channel 15
Channel 19
Channel 23
Channel 27
Channel 31
4 4 4 4 4 5 5 5
5 6 7 8 9 0 1 2
0x06 0x07 0x08
0x0C
HiByte LoByte
Hour Minute
hh mm
Modbus TCP server
A B C D
------ Timestamp ------
Channel 4
Channel 8
Channel 12
Channel 16
Channel 20
Channel 24
Channel 28
Channel 32
5 5 5 5 5 5 5 6
3 4 5 6 7 8 9 0
0x09
0x0D
HiByte LoByte
Second
Reserved
ss
CP9xx_D00349_07_M_XXEN/01.2020
E F
C D R.
6 6 6 6
1 2 3 4