Configuring Serial Port Parameters - GE VersaMax PLC User Manual

Feature Description
Port Mode Defines the protocol.
Parity Determines whether parity is
added to words
Data Rate (bps) Data transmission rate (in bits
per second).
Flow Control Specifies the method of flow
control to use.
(not required if Port When changing Flow Control
Mode is SNP) from None to Hardware,
Turnaround Delay is reset to 0.
Timeout Specifies the set of timeout
values to be used by Protocol.
(If Port Mode is SNP)
Stop Bits Number of stop bits used in
transmission. (Most serial
(If Port Mode is SNP or
devices use one stop bit; slower
Serial I/O)
devices use two.)
SNP ID 8-byte ID for Port 1.
Receive to transmit Delay between receiving last
delay character of a message to
asserting RTS
Turnaround delay Delay between asserting RTS
and transmitting a message
RTS drop delay Delay between when the last
character of a message is
transmitted and when RTS is
dropped.
76 GFK-1503E
For public disclosure

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.
Default
SNP
Odd. For CPUE05, when
Port Mode is Local Station
Manager, default is None.
Serial comms modes:
19200
CPUE05 in Local Station
Manager mode: 9600
None
Long
1
None
0
SNP: none
RTU & Serial I/O: 0
0
Choices
SNP, Serial I/O, RTU, Disabled.
CPUE05 can also be configured as
a Local Station Manager.
Odd, Even, None
SNP: 4800, 9600, 19200, 38400
RTU: 1200, 2400, 4800, 9600,
19200, 38400, 57600
Serial I/O: 4800, 9600, 19200,
38400, 57600
Local Station Manager mode: 1200,
2400, 4800, 9600, 19200, 38400,
57600, 115200
RTU mode: None, Hardware
Serial I/O mode: None, Hardware,
Software
CPUE05 in Local Station Manager
mode: None, Hardware
Long, Medium, Short, None
1, 2
Editable
SNP: Not available
RTU and Serial I/O: 0-255 (units of
10ms, e.g. 10=100ms)
SNP: Long, Medium, Short, none
RTU & Serial I/O: 0-255 (units of
10ms, e.g. 10=100ms)
SNP: Not Available
RTU and Serial I/O: 0-255 (units of
10ms, e.g. 10=100ms)
VersaMax PLC User Manual