Nexen RSD200 964531 User Manual
Page 23
2
FORM NO. L-21161-E-0108
11.0 APPeNDIx
RS232 Communications can be used to broadcast
Diagnostic Parameters from the RSD200 to a device
such as a PLC or computer. At the same time, the PLC
or computer would control the Start/Stopped and Splice
signals to the RSD200.
Serial Communication is achieved with RS232 through
a null modem cable. Data Transmission for each byte
follows the format “19200, N, 8, 1” (19200 baud, No
Parity, 8 data bits, 1 stop bit) with no handshaking.
Data is transmitted in 8 bit binary format, meaning that
a number 0 to 255 is considered 1 byte and a number
0 to 65535 or -32676 to +32676 is considered two
bytes. If a data item is two bytes long, the MSb is sent/
received first and the LSb second.
Data is sent and received in Message Packets that are
comprised of bytes of information (Refer to Table 3).
The Checksum can be used as an error-checking tool
to confirm the data sent on one end is the same as the
data received on the other end. Use the Start byte to
designate the beginning of a new message packet as
well as the Stop byte to designate that the entire packet
was sent/received. The Packet Size is the number of
bytes in the packet, excluding the start and stop bytes.
•
For commands sent from a PLC/Computer to the
RSD200, refer to Table 4.
•
For commands and/or data sent from the RSD200
to a PLC/Computer, refer to Table 5.
The Functional Test command can be used to confirm
the communications are working properly.
1. From a PLC/Computer, send a Functional Test mes-
sage packet (See Table 4).
2. If functioning properly, the RSD200 will immediately
send a Functional Test packet back to the PLC/
Computer (See Table 5).
The Machine Start/Stopped command operates as a
maintained input therefore the Rotary Mode Switch
needs to be in the “1” position (Refer to Start/Stopped
section.)
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Table message Packet Protocol
C
OmmAND
ID
F
UNCTION
e
xAmPLe
6
Start Diagnostics
1, 3, 6, 6, 0
7
Stop Diagnostics
1, 3, 7, 7, 0
14
Splice - True (Data=1) 1, 4, 14, 1, 15, 0
14
Splice - False
(Data=2)
1, 4, 14, 2, 16, 0
15
Machine Start
(Date = 1)
1, 4, 15, 1, 16, 0
15
Machine Stopped
(Data = 2)
1, 4, 15, 2, 17, 0
16
Functional Test
1, 3, 16, 16, 0
Table message Packets for PLC/Computer to RSD
C
OmmAND
ID
F
UNCTION
e
xAmPLe
6
Receive Diagnostics Data
1, 13, 6,
Data,
Checksum, 0
Data
Range
Arm Position
0-255
Splice
0/1
Start/Stopped
0/1
Output
0-255
Pressure
0-10,000
Tension
0-10,000
Adaptation
0-10,000
16
Functional Test
1, 3, 16, 16,
0
Table message Packets for RSD to PLC/Computer
C
OMMuniCatiOnS
P
ROtOCOl