User's Manual

COBALT UHF-SERIES CHAPTER 7: MODBUS TCP INTERFACE
PAGE 116 OF 140
7.2.3 Modbus TCP - Response Packet Structure
Produce Registers hold data that is destined for the host or PLC.
MODBUS
ADDRESS
(4XXXX /
3XXXX)
READ / WRITE
PRIVILEGE
REGISTER DESCRIPTION
(40001) 1
R/W 2-byte Produce Data Overall Length
(> 0 indicates data is available; Modbus Client
clears to 0 after data is processed)
2
RO MSB = Reader Type
LSB = Command Echo
3
RO Node ID Number (33 for the Cobalt)
4
RO Timeout Value (0-65535)
5
RO Read/Write Start Address (0-65535)
6
RO Read/Block Size (0-65535 bytes)
7 – 32774
RO Cobalt Produce Data (when applicable)
32775 – 65536
RO Reserved
Table 7-2: Modbus TCP - Response Packet Structure
7.2.4 Modbus TCP - Mapping for Node 33
MODBUS
ADDRESS
(4XXXX)
READ /
WRITE
PRIVILEGE
REGISTER DESCRIPTION
1
R/W IP Address 1 (MSB) Example: 192
2
R/W IP Address 2 Example: 168
3
R/W IP Address 3 Example: 000
4
R/W IP Address 4 (LSB) Example: 100
5
R/W Subnet Mask 1 (MSB) Example: 255
6
R/W Subnet Mask 2 Example: 255
7
R/W Subnet Mask 3 Example: 255
8
R/W Subnet Mask 4 (LSB) Example: 000
9
R/W Gateway Address 1 (MSB) Example: 192
10
R/W Gateway Address 2 Example: 168
11
R/W Gateway Address 3 Example: 000
12
R/W Gateway Address 4 (LSB) Example: 001