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2600 Family Instruction Manual

Chapter 4 : Serial Communication Server

4.4.2 Send

Function Transmits a character string.

Opcode 0x01

Command Data[]

Response (Status)

Notes All bytes in Data[] are buffered on the MM for

transmission to the remote serial device. The

transmit buffer is a FIFO, so any bytes that are

already pending in the transmit buffer will be sent

first, before the new data bytes.

The MM determines the number of data bytes in

the com port command by means of the UDP

datagram size. The MM assumes that all bytes

following the first com port command byte are

data bytes that are to be transmitted to the remote

serial device.

Note that the MM does not employ any delimiter

characters, such as carriage returns, to denote

logical partitions in the serial data stream.

4.4.3 Receive

Function Returns a received character string.

Opcode 0x02

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

Response (Status),Data[]

Notes The client can determine the number of bytes

received from the MM by examining the size of

the UDP datagram that comprises the com port

response. The size of Data[] equals the size of

the datagram minus one. The size of Data[] is

guaranteed to never exceed MaxSize.

All of the bytes returned in Data[] are removed

from the com port receive buffer.

4.4.4 ClearFlags

Function Resets to zero the BRK bit and all error flags in

the status byte.

Opcode 0x03

Command none

Response (Status)

4.4.5 Open

Function Enables the serial transmitter and receiver.

Opcode 0x04

Command none

Response (Status)

Notes Before issuing an Open command, the

SetMode command should be used to configure

the target com port for proper operation.

Upon module reset, all com ports default to the

closed (disabled) state. Each com port must be

enabled by Open before it will communicate

with a remote serial device.

Parameter Function

Data[] Array of byte values to be transmitted

to the remote serial device.

Parameter Function

Status Com port status. The REJ bit flag will

be set if the transmit buffer has

insufficient free space to accommodate

the specified byte string.

Parameter Function

MaxSize Maximum number of bytes to return.

The MM will return the smaller of

MaxSize bytes or all unread bytes that

have been received from the remote

serial device.

Parameter Function

Status Com port status.

Data[] Array of byte values received from the

remote serial device.

Parameter Function

Status Com port status condition that is

effective after this action executes.

The FRM, PAR, OVR and WRP bits are

all reset to zero.

Parameter Function

Status Com port status. The REJ flag will be

set if the port is already open.

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