ASCII Protocol
PLX30 Series
User Manual
Ethernet and Serial Gateways
Page 162 of 200
ProSoft Technology, Inc.
September 19, 2012
Any combination of bits is acceptable to the gateway and should be set to match
the device on the specific port. An example of each termination type is given
below.
Termination character(s) used
Settings:
Count = 1 (RTermCnt=1)
Termination on 0x0d (carriage return character) (RTermChar = 0d 00 00 00 …)
Data Received on port:
A
B
C
0x0d
D
E
Comment:
The characters "ABC" will be sent along with the 0x0d character to the controller after the
0x0d character is received. The characters "DE" will not be sent until the 0x0d character is
received.
Message timeout used
Settings:
Message timeout = 1000 mSec (Rtimeout=1000)
Data Received on port:
TIME
0
1000 mSec
2000 mSec
A
B
C
D
E
F
G
Comment:
After the 'A' character is received on the port, the message timeout is started.
The characters "ABCDE" will be sent to the controller in one block. The characters
"FG" will follow in the second block one second later.
Intercharacter delay timeout used
Settings:
Intercharacter delay timeout = 300 mSec (Rdelay=300)
Data Received on port:
TIME
0
1000 mSec
2000 mSec
A
B
C
D
E
F
G H
>=300mSec time gap
Comment:
After each character is received, the intercharacter delay timer is reset. The characters
"ABCDEF" will be sent to the controller in one block because the delay timer expires.
The characters "GH" will follow in the second block when the next time gap is recognized.
Packet size limit used
Settings:
Packet size = 4 (RPacketLen=4)
Data Received on port:
A
B
C
D
E
F
G H
I
J
Comment:
The first block sent to the controller will contain the characters "ABCD", and the second
block will contain the characters "EFGH". The characters "IJ" will not be sent until two
more characters are received on the port.
