5.3.4
Configuring Serial Port Parameters
Both ports on a VersaMax PLC CPU are configurable for SNP slave or RTU slave
operation. 4-wire and 2-wire RTU are supported. For CPUE05 only, port 1 can also be
configured (on another tab) for Local Station Manager operation. The Local Station
Manager parameters may differ from the Port A parameters.
Feature
Description
Default
Choices
Port Mode
Defines the protocol.
SNP
SNP, Serial I/O, RTU, Disabled.
CPUE05 can also be configured as
a Local Station Manager.
Parity
Determines whether parity is
added to words
Odd. For CPUE05, when
Port Mode is Local Station
Manager, default is None.
Odd, Even, None
Data Rate (bps)
Data transmission rate (in bits
per second).
Serial comms modes:
19200
SNP: 4800, 9600, 19200, 38400
RTU: 1200, 2400, 4800, 9600,
19200, 38400, 57600
Serial I/O: 4800, 9600, 19200,
38400, 57600
CPUE05 in Local Station
Manager mode: 9600
Local Station Manager mode: 1200,
2400, 4800, 9600, 19200, 38400,
57600, 115200
Flow Control
Specifies the method of flow
control to use.
None
RTU mode: None, Hardware
(not required if Port
Mode is SNP)
When changing
Flow Control
from
None
to
Hardware
,
Turnaround Delay is reset to 0.
Serial I/O mode: None, Hardware,
Software
CPUE05 in Local Station Manager
mode: None, Hardware
Timeout
Specifies the set of timeout
values to be used by Protocol.
Long
Long, Medium, Short, None
(If Port Mode is SNP)
Stop Bits
Number of stop bits used in
transmission. (Most serial
devices use one stop bit; slower
devices use two.)
1
1, 2
(If Port Mode is SNP or
Serial I/O)
SNP ID
8-byte ID for Port 1.
None
Editable
Receive to transmit
delay
Delay between receiving last
character of a message to
asserting RTS
0
SNP: Not available
RTU and Serial I/O: 0-255 (units of
10ms, e.g. 10=100ms)
Turnaround delay
Delay between asserting RTS
and transmitting a message
SNP: none
SNP: Long, Medium, Short, none
RTU & Serial I/O: 0
RTU & Serial I/O: 0-255 (units of
10ms, e.g. 10=100ms)
RTS drop delay
Delay between when the last
character of a message is
transmitted and when RTS is
dropped.
0
SNP: Not Available
RTU and Serial I/O: 0-255 (units of
10ms, e.g. 10=100ms)
76
GFK-1503E
VersaMax PLC User Manual
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