Spirax Sarco BC3250 - 7. Communications; 7.1 Infrared (IR); 7.2 RS485 Addressing

IM-P403-89 EMM Issue 8
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Fig. 34
7. Communications
7.1 Infrared (IR)
All products in the range can communicate via an infrared bus between adjacent controllers.
It enables the parameters of up to seven products to be passed to a product fitted with an
RS485 (products with a graphics display).
The product connected to the RS485 network must be fitted on the left of all the slaves fitted
to the IR bus (Figure 32) and have 'master' selected in the 'output-comms' menu.
Two or more IR buses can share the same panel or DIN rail by selecting another IR master.
Master 2 will ignore bus 1. See Figure 33.
Fig. 32 IR Bus
RS485
IR Bus 1 IR Bus 2
Fig. 33
RS485
RS485
To add another slave into an existing IR bus, either re-select 'master' or turn its power OFF
and then ON. Only an IR master can pass the IR bus parameters to the RS485 network. If a
slave is also connected to the RS485 network, only its parameters are passed.
7.2 RS485 addressing
An offset is added to the register addresses (see above) for each device, depending on their
position on the IR bus, ie. the master's offset is 0, the device to its right has an offset of 100,
the one to its right hand side 200 and so on.
IR Bus
RS485
Master Slave Slave Slave Slave
Master Slave Slave Slave Slave Master Slave Slave Slave Slave
Master Slave Slave Slave
IR address 1 2 3 4 5
RS485 offset 0 100 200 300 400
Slave