User manual

Chapter 4 Configuration
Page 131 ©February 2009
4.15 Connecting Serial I/O
NOTE – Serial I/O Expansion are only possible for 105G Firmware versions 1.50 onwards.
Serial expansion modules can be connected to the RS485 port of all 105G units except for the
105G-MD1 unit.
If Serial Expansion modules are required to connect to an MD1 then it can only be done under
the following circumstances.
• If the 105G is configured as a “Repeater-only” under the Protocol selection.
• IF the Serial expansion module is setup as a Modbus Slave and the Gateway module
is a MD1 Master.
Up to 10 x 115S modules can be connected to each 105G.
To enable the 105G serial port for Serial expansion, select the “Enable Serial Expansion” box as
shown above.
Note that enabling Serial expansion also disables on-line diagnostics via the serial port.