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2600 Family Instruction Manual

Chapter 4 : Serial Communication Server

This flag is automatically reset at the beginning of each

command.

• OPN indicates that the com port is open (i.e., transmit and

receive operations are enabled). This flag is set by the

Open action and reset by the Close action. All com ports

default to the closed state upon module reset.

• FRM indicates that a character framing error was detected

on a received character. The faulty character is discarded.

• PAR indicates that a parity error was detected on a

received character. The faulty character is discarded.

• OVR indicates that the receive buffer overflowed. This

will happen if either (1) the UART receiver overflowed

because incoming characters occurred at a rate that is

faster than the MM can process them, or (2) the receive

buffer is full and another receive character arrived at the

UART.

In most applications, assertion of any of the error flags will be

cause for discarding all data received from the remote device.

Error flags may be reset by issuing a ClearFlags command

to the target com port. See Section 4.4.4 for details.

4.4 Com Port Commands

This section describes the commands that are supported by the

MM communication server.

4.4.1 SetMode

Function Programs the operating mode.

Opcode 0x00

Command (ClockDiv[0]),(ClockDiv[1]),

(Attrib),(LEDs)

In the following subsections, bold type indicates

the default settings that are in effect after a

module reset.

4.4.1.1 Baud Rate

ClockDiv specifies the baud rate for both

transmitter and receiver. It may be set to any of

the following values in order to program standard

baud rates. Setting ClockDiv to any value not

shown in the table will result in a non-standard

baud rate.

4.4.1.2 Operational Attributes

The Attrib byte (Figure 30) specifies various

operational attributes for the communication

interface.

Table 8: Summary of Com Port Commands

Command Opcode Function

SetMode 0x00 Program the port’s operating mode.

Send 0x01 Transmit a character string.

Receive 0x02 Receive a character string.

ClearFlags 0x03 Reset error flags.

Open 0x04 Enable transmit and receive.

Close 0x05 Disable transmit and receive.

Flush 0x06 Dump receiver buffer.

GetRxCount 0x07 Return receive buffer character count.

GetTxCount 0x08 Return transmit buffer character count.

StartBreak 0x09 Enable break transmission.

EndBreak 0x0A Disable break transmission.

BreakChar 0x0B Set break character.

Parameter Function

ClockDiv Clock divisor for the baud rate

generator.

Attrib Collection of bit fields that set

various operating attributes.

LEDs Specifies the behavior of the com

port’s status LED.

Baud Rate

(bits/second)

ClockDiv[0]

(hex)

ClockDiv[1]

(hex)

300 00 03

600 80 01

1200 C0 00

2400 60 00

4800 30 00

9600 18 00

19.2K 0C 00

38.4K 06 00

57.6K 04 00

115.2K 02 00

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 79 80

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