28
Manual Supplement
00809-0400-2410, Rev AA
Rosemount 2410 Tank Hub
March 2016
Rosemount 2410 Tank Hub
1.5.5 Automatic protocol switch mechanism
The tank hub supports a special mechanism to switch protocol from Enraf to Modbus. If the
tank hub detects about 20 corrupted messages in a row, the protocol will be switched
(1)
.
Figure 1-7. Automatic Protocol Switch Mechanism
This mechanism can be disabled by clearing bit 1 in the following holding registers:
Table 1-11. Holding Register, Automatic Protocol Switch Mechanism
1.5.6 Relay configuration
For application software version 1.D1 and later, the state of the tank hub relays, K1 and K2,
can be included in the Enraf alarm status (as).
An example of use is when a dry contact is connected to a temperature device such as
Rosemount 644 or 2240S Temperature Transmitter. The K1 and/or K2 relays are then
configured to be controlled by the temperature value, and the relay status will be available
in Enraf alarm status (as).
Alarm status
Bit 14 and/or bit 15 in holding register 1060 “EnrafMiscCtrl” can be used to have the High
and Low alarms controlled by the K1 and K2 relay states instead of the alarm limits:
If bit 14 “Use_K1_High_Alarm_Status” is set:
Alarm status is set to High alarm if K1 is de-energized
Relay K2 will have no effect
If bit 15 “Use_K1_K2_High_Low_Alarm_Status” is set:
Alarm status is set to High Alarm if K1 is de-energized, and set to Low alarm if K1 is
energized and K2 is de-energized
1. It might take up to 60 seconds before the protocol switches.
Register number Holding register
Primary field bus
706 MiscConfigPri
Secondary field bus
756 MiscConfigSec
1200 baude rate
8 data
No parity
1200 baude rate
7 data
Odd parity
20 corrupted messages,
protocol switches
Modbus mode
Enraf mode
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