A&D Super Wash Down Scales SW-150KL - Manual (Page 38)

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Example of connection
RS-422 RS-485
‰ The polarity (A, B) of the host computer signal depends on the computer model.
Check the technical manual of the computer.
Data format
The data format for the RS-422/485 is the same as the RS-232C except the following:
‰ When used with the function setting “ 5if 1 ” (RS-422) or “ 5if 2 ” (RS-485), set a
different address to each scale using the function setting “
adr
##”. ((##=01 to 99)
‰ Start all commands with “@##” (## is the address of the scale to send a command).
All replies from the scale start with “@##”.
The format after “@##” is the same as the RS-232C, both in commands and replies.
‰ When used with the RS-485 interface (function setting: “
5if 2
”), note the following:
• When sending commands continuously, leave an interval of 500 ms or more
between commands.
• Do not use stream mode (function setting: “ prt 0
”) when sending commands.
Commands will not be received correctly and will be invalid.
Connect TRM to RDB
at the farthest SW from
the host computer.
Host computer RDA
RDB
SDA
SDB
SW SDA
Address 01
SDB
RDA
RDB
TRM
SW SDA
Address 02
SDB
RDA
RDB
TRM
SW SDA
Address 16
SDB
RDA
RDB
TRM
Terminator (may be
built in the computer). Terminator (may be
built in the computer).
Host computer
A
B
SW SDA
Address 01
SDB
RDA
RDB
TRM
SW SDA
Address 02
SDB
RDA
RDB
TRM
SW SDA
Address 16
SDB
RDA
RDB
TRM