Datasheet

Table Of Contents

dS3484

dS3484 User Manual v4.03

Function 15 (0x0F) Write Multiple Coils

Use this function when you need to write to multiple relays and I/O’s at the same time. Coils

1-4 are the relays 1-4. Virtual relays 5-32 are coils 5-32. Coils 41-48 are the I/O's 1-8

remapped to 41-48.

Error code 1

This error is returned if an unknown or unimplemented function is received. Only functions 1, 4

& 5 are implemented.

Error code 2

This error is returned if an illegal address is requested. Addresses greater than 15 for functions

1 & 5 or greater than 7 for function 4 will generate this error.

Error code 3

This error is returned if an illegal data value is received. Number of points = zero will generate

this as will an illegal data value for function 5.

Modbus Gateway

If the Modbus/TCP/IP frame has a UID that does not match the one you set in the TCP/IP

config screen, the module will assume this is for another Modbus module connected to the

RS485 port. It will use the UID as the Module address, convert the request to RTU format and

send it to the downstream module. This could be an MBH88 for example. The return frame is

then converted back to Modbus/TCP/IP format and returned to you.

Make sure you set the Parity and Baud Rate in the TCP/IP config screen to match your Modbus

RTU modules.