Writing multiple coils using AMX Modbus module

The AMX modbus module works perfectly with the modbus functions to write to single coils, holding or input registers but the comm module which is open doesn't have a function to write to multiple coils. I have attached the function details using the link below and the modbus mapping is given in the attachment in this post. Multiple coils is needed for room modes, fan speed modes, etc.

http://modbustools.com/modbus.asp#function15