problem to start

[MonteC1]

http://SSMaker.ru/d3026efe/

[MonteC1]

how to read the value of the first register?
device description - https://contactless.ru/wiki/index.php/Relay_Module_Modbus_Management by

default,,1,ZZZZ,1,104,1
/Modbus/relay-6сh/1ch/status, 0 

What should be where - ZZZZ ?
If we read coil register where the possible values 0 or 1

thanks in advance