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2600 Family Instruction Manual

Chapter 4 : Serial Communication Server

Figure 30: Attributes Byte

PHY

These two bits specify the physical layer type and

behavior as follows:

Notes

1. PHY values 10 and 11 are available only on model 2601

Revision D (or later) circuit boards.

PHY=00: Full-duplex RS-232.

PHY=01: Full-duplex RS-422. Both receiver

and transmit line driver are enabled at all times.

PHY=10: Half-duplex RS-422 or RS-485. The

transmit line driver is enabled only while

characters are being sent; it is automatically

disabled (tri-stated) when the transmitter is idle.

The receiver is enabled only when the transmitter

is idle, so that receive characters are blocked

while the transmitter is active. The receiver

turn-around time is 250 microseconds,

maximum.

PHY=11: Full-duplex RS-422 or RS-485. The

transmit line driver is enabled only while

characters are being sent; it is automatically

disabled (tri-stated) when the transmitter is idle.

The receiver is enabled at all times. This mode

can be useful for multi-master RS-485 device

networks that require collision detection. The

receiver turn-around time is 250 microseconds,

maximum.

Refer to Section 4.2.2 for information about how

to configure PHY for various device network

topologies.

FLOW

This bit enables XON/XOFF flow control. See

Section 4.1.1 for information about flow control.

PAR

These two bits specify whether even, odd, or no

parity will be applied to transmitted and received

characters. When even or odd parity is enabled,

all incoming characters are parity checked and

any parity errors will be detected and reported.

STOP

This bit specifies the number of stop bits to send

when transmitting a character.

DAT

These two bits specify the number of data bits to

be used in both transmitted and received

characters.

4.4.1.3 LED Behavior

The LEDs byte is shown in Figure 31. When set

to logic one, each bit will cause the com port’s

status LED to light for approximately 100

milliseconds in response to the associated event.

Any combination of these bits may be specified.

For example, the XMT and RCV bits may both be

set, in which case the LED will light when a

character is sent or received at the com port.

After a module reset, the RCV flag is set and all

other flags are reset to zero.

Figure 31: LEDs Byte

XMT causes the LED to light when a character is

transmitted.

RCV causes the LED to light when a character is

received.

ERR causes the LED to light when a receiver

break condition is detected or when an error

(framing, overrun or parity) is detected.

Response (Status)

Notes The target com port must be closed when this

command is issued. If the com port is open, the

command will be rejected and the returned status

byte’s REJ flag will be set.

PHY Duplex Type Tx Enabled

00 Full RS-232 Always

01 Full RS-422 Always

Half

RS-422 / RS-485

When

Sending

Full

FLOW PAR0 STOP DAT1 DAT0

PAR1

00 = 5 bits

Char Size

01 = 6 bits

10 = 7 bits

11 = 8 bits

X0 = None

Parity

01 = Odd

11 = Even

0 = 1 bit

Stop Bit Length (in bit times)

1 = 1.5 bits (char size 5)

1 = 2 bits (char sizes 6,7,8)

XON/XOFF

00 = RS232

Physical Layer

01 = RS422, Tx always on

Flow Control

PHY1 PHY0

10 = RS485

11 = RS422, idle 3-state

0 = Disabled

1 = Enabled

Parameter Function

Status Com port status. The REJ bit flag

will be set if the com port is open.

5 4

XMT

2 1 0

RCV

ERR

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 79 80

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