3.2.
Example of RS-485 Connection
4 Communication Function Parameters
The baud rate, data length, parity bit, stop bit, delimi ter, and device ID are the user-selectable parameters of the
communication functions provided by the AM-215A panelmeter. For details on how to set the parameters, see the
user’s manual of the AM-215A main unit.
5 RS-485 Transmission/Reception Formats
5.1
Establishing and Releasing the Communication Link
5.2.
Available Control Codes
User’s Manual AM-215A Series RS-485
2/8
RS-485/
RS-232C
converter
Model SI-30 from
Line Eye
Co., Ltd. or other
equivalent converters
+
-
SG
Note: If these lines are likely to be affected
by noise or the like, use shielded wire.
+
-
+
-
+
-
+
-
Note: If the panelmeter is an end station, set the terminator to ON.
AL1 AL2
Ｅ
Ｍ
AL1 AL2
Ｅ
Ｍ
AL1 AL2
Ｅ
Ｍ
AL1 AL2
Ｅ
Ｍ
Function
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23
Char. Length
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Char. Length
Establishment of communication link
ENQ
0
1 CR LF
3
ACK
0
1 CR LF
3
Note: Set a two-digit number as the device ID (00 is void).
(Normal response)
Note: The response time is 40 ms maximum.
(No response is made if the device ID is wrong.)
Release of communication link
EOTCR LF
1
Note: Communication is still possible when another device ID is specified without releasing
(No response is made for release.)
the communication link.
Note: The response time is 20 ms maximum.
Control Code
Hexadecimal
Name
Description
STX
02H
Start of Text
Marks the starting point of text.
ETX
03H
End of Text
Marks the ending point of text.
EOT
04H
End of Transmission Marks the end of transmission.
ENQ
05H
Enquiry
Denotes an enquiry.
ACK
06H
Acknowledge
Denotes an affirmative reply.
