Maximum payload

There is a maximum payload that you can send at one time, depending on the device's configuration.

These maximums only apply in API mode. If you attempt to send an API packet with a larger payload than specified, the device responds with a Transmit Status frame (0x89) with the Status field set to 74 (Data payload too large).

In Transparent mode, the firmware splits the data as necessary to cope with maximum payloads.