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Modbus Commands

C-22

TIWAY I Gateway User Manual

Modbus Function Descriptions (continued)

able C-5

Event

Byte T

ypes

Event Byte Bit Definitions

Slave Bus Receive. Byte

stored on receipt of message

Bit 0 – Reserved

Bit 1 – Set if communications error

Bit 2 – Reserved

Bit 3 – Reserved

Bit 4 – Set if character overrun

Bit 5 – Set if in Listen Only mode

Bit 6 – Set if Broadcast

Bit 7 – 1

Slave Bus Transmit. Byte

stored when message sent

Bit 0 – Set if an exception (1–3) is sent

Bit 1 – Set if secondary abort exception (6) is sent

Bit 2 – Set if secondary busy exception (6) is sent

Bit 3 – Not used

Bit 4 – Set if write timeout occurred

Bit 5 – Set if in Listen Only mode

Bit 6 – 1

Bit 7 – 0

Initiate Communications

Reset. Complete log is set

to zeros.

Bit 0 – 0

Bit 1 – 0

Bit 2 – 0

Bit 3 – 0

Bit 4 – 0

Bit 5 – 0

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 93 94

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Siemens SIMATIC TI500 Manuale Utente Pagina 71