Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Uživatelský manuál stáhnout pdf (Strana 169)

9–31Diagnostic Counters

Publication

17706.5.16 - October 1996

Below are diagnostic counters for the channel 0 serial port.

These counters vary depending on whether the port is configured for:

• point-to-point (full-duplex)

• half-duplex slave

• half-duplex master

This counter byte Counts the number of

0, 1 General status words.

Contains serial port information as defined below:

•0 Bit 0: status of CTS (1 = asserted, 0 = deasserted)

Bit 1: status of RTS (1 = asserted, 0 = deasserted)

Bit 2: status of DSR (1 = asserted, 0 = deasserted)

Bit 3: status of DCD (1 = asserted, 0 = deasserted)

Bit 4: status of DTR (1 = asserted, 0 = deasserted)

Bit 5: status of modem connection (1 = lost)

Bits 6, 7: reserved

•1 Bits 811: mode of serial port (0000 = system, 0001 = 1

user)

Bits 1214: reserved (set to 0)

Bit 15: input buffer overflow (user mode only). More than

256 characters have been received before the

execution of an ASCII read instruction.

2, 3 Messages sent (indicating retries).

4, 5 Messages received with proper BCC or CRC.

6, 7 Undelivered messages.

8, 9 ENQs sent.

For this protocol This is the number of

fullduplex ENQs sent

half duplex message retries

10, 11 NAKs received.

12, 13 ENQs received.

14, 15 Bad packets received - packets received with incorrect BCC or

CRC.

16, 17 NAKs sent.

18, 19 Duplicate messages received.

20, 21 Received errors (user mode only).

Number of characters thrown away due to parity, overflow, and

framing errors.

22, 23 Number of times DCD went low and then high - DCD recovered.

24, 25 Number of times modem connection was lost.

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 250 251

Žádné komentáře

Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Uživatelský manuál Strana 169