Omron E5ZN - Communication Protocols; Compoway;F Communication Protocol; Communications Specification; Communications Procedure

64
Communication Protocols Section 5-1
5-1 Communication Protocols
5-1-1 CompoWay/F Communication Protocol
CompoWay/F is a standard OMRON communications protocol for general-
purpose serial communications. It uses a standard frame format as well as
FINS commands that have been proven in data exchange between OMRON's
Programmable Controllers (PCs). The CompoWay/F format facilitates serial
communications between components or a PC and components.
FINS (Factory Interface Network Service)
FINS is a protocol for message communications between Controllers in
OMRON FA networks.
Note The program for communications is created on the host PC and E5ZN's parameters
are monitored or set from the host PC. In this manual, descriptions of communications
are given from the standpoint of the host PC.
5-1-2 Communications Specification
Transmission line connection: Multipoint
Communications method: RS-485 (Two-wire, half-duplex)
Synchronization method: Start-stop synchronization
Baud rate: 4.8 k, 9.6 k
, 19.2 k, or 38.4 k bit/s
Communications code: ASCII
Word length: 7
or 8 bits
Stop bit length: 1 or 2
bits
Parity check: Vertical parity - None, Odd, or Even
BCC (block check character)
Start-stop synchronization data composition
Flow control: None
Interface: RS-485
Retry function: None
Note Default settings are underlined.
5-1-3 Communications Procedure
Communications between the Temperature Controller and the host PC are
implemented on a frame-by-frame basis.
When the host PC sends a command frame to the Temperature Controller, the
Temperature Controller returns to the host PC a response frame that corre-
sponds to the command frame.
Command and response frames are transmitted as follows:
Allow a minimum wait time of 5 ms from when the host PC receives the re-
sponse from the Temperature Controller until the host sends the next com-
mand.
Note Errors may occur in communications data due to ambient noise. To increase the reli-
ability of the system, OMRON recommends executing retry processing to resend the
command when an error response frame is detected.
Host PC
C
o
m
m
a
n
d
f
r
a
m
e
C
o
m
m
a
n
d
f
r
a
m
e
R
e
s
p
o
n
s
e
f
r
a
m
e
R
e
s
p
o
n
s
e
f
r
a
m
e
Temperature Controller