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Environmental Monitoring System (EMS-5X, 10X and OS) Instruction Manual
27
4.2.5
Modbus Settings
If monitoring the EMS via
Modbus TCP/IP
then enable Modbus in the
TCPModbusSettings
attribute
folder (see subsection
A. Ethernet / TCP Configuration
If monitoring the EMS via
Modbus RTU
then enable Modbus in the
SerialModbusSettings
attribute
folder (see subsection
B. Serial Link / RTU Configuration
Instructions assume the parent
EMSSettings
attribute folder has already been expanded.
The system only responds to
Modbus
Function 03
(READ HOLDING REGISTERS).
All other Modbus messages are ignored.
The corresponding Bit value for
Register 0
is
1 less
than the Relay number (e.g. Bit 0
corresponds to Relay 1, etc).
Using either an Ethernet/TCP or Serial/RTU
Modbus configuration,
Register 0
(Master Station Relay Bits) and
Register 1
(Interface Board; Register 2 onwards for Outstations are identical) are:
REGISTER 0
Master Station Relays
REGISTER 1
Interface Board
Bit
Corresponding Relay
Bit
Corresponding Function
0
Relay 1: Configurable
0
Interface board online
1
Relay 2: Configurable
1
Zone 1 fault
2
Relay 3: Configurable
2
Zone 2 fault
3
Relay 4: Configurable
3
Zone 3 fault
4
Relay 5: Configurable
4
Zone 4 fault
5
Relay 6: Configurable
5
Zone 5 fault
6
Relay 7: Configurable
6
Zone 1 alarm
7
Relay 8: Configurable
7
Zone 2 alarm
8
Relay 9: Configurable
8
Zone 3 alarm
9
Relay 10: Configurable
9
Zone 4 alarm
10
Relay 11: Common Alarm / Fault Relay
10
Zone 5 alarm
11
Relay 12: Cable Break
11
Not Used.
12
Relay 13: Alarm
12
13
Relay 14: Configurable
13
14
Relay 15: Watchdog
14
15
Relay 16: Spare / Unused
15
Table 7:
Register 0 Corresponding Replays and Register 1 Corresponding Functions