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NewProt

Protocol used. 1 or 2 for Modbus. See “Setting the GCM communications

parameters” on page 2.

LastProt

Transient indication of the last protocol initialized. Normally same as “Prot”

BaudIdx

Index of the baud rate used: See “Setting the GCM communications parameters” on

page 2.

LinePar

Line parameters. See “Setting the GCM communications parameters” on page 2.

ISRProt

Protocol Selector for the UART interrupt service routine. Typically same as Prot

Route

Routing for the XDC board. Always 0 for Modbus.

PrState

Prelude State. Not used, always zero.

Port

Port index. 0 for port 1 (UART 0, lower row on connector) 1 for port 2 (UART 1,

upper row on connector)

Ints

UART Interrupt counter. Increments for any serial activity. Since the UARTs have 16

byte FIFOs, this counter typically increments slower than Rxchs and Txchs.

Rxchs

Received characters counter

Txchs

Transmitted characters counter

Rxuae

Receiver UART error counter.

Rxlua

UART Line Status Register at the last UART error. Bit encoded:

Bit 0 Receiver data ready. This is not an error

Bit 1 Overrun error

Bit 2 Parity error

Bit 3 Framing error

Bit 4 Break condition

Bit 5 Transmitter holding register empty. This is not an error

Bit 6 Transmitter empty. This is not an error

Bit 7 At least one error in receiver FIFO

Sta

UART Line status register at the last character received. See Rxlua above. Typically

0x61.

Cha

Hex representation of the last character received

Rxillmsr

Counter for illegal Modem Status Interrupt. The UART is configured to not generate

MSRs. Only UART1 has modem status lines. Should always be 0.

Rxilluae

Counter for illegal (not enabled) UART error interrupts. Should always be 0.

Txboverr

Transmitter buffer overrun counter. Increments if an attempt is made to transmit

characters past the end of the transmitter character buffer, indicating a bug in the

protocol handler. Should always be 0.

Rxboverr

Receiver buffer overrun counter. Increments when the receiver buffer is filled up

without an end of telegram condition.

Iir

UART Interrupt Identification Register at last interrupt.

Wastmo

Indicates that the last UART receiver interrupt was a UART character timeout (Stale

data in FIFO) rather than a “FIFO trigger limit reached”.

Illints

Counter for undocumented IIR patterns. There appears to be a bug in the UART

that, under adverse conditions, causes this to happen.

Unita

Controller/Station/Node number ID of the GCM in multidrop settings. Must be

different for each connected GCM on the Modbus segment.

Map

Enumeration of the CIT map format. Set to 1 for standard CIT mapping.

MaxTime

Silence time for isTimeout (see below) in seconds. A value of zero is interpreted as

“never” meaning isTimeout will never be true.

1 2 3 4 5 6 7 8 9 10 11

Transmit 7

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