Operation; Network Protocol - GSE 60 SERIES Technical Reference Manual

i
MODBUS™ protocol supports RS-
485 electrical standard for the 60
Series instruments. Refer to
MODBUS™ Communications on
page 1-25 for more information.
Example: Macro Data Packet Setup
1%"Select COMM 1 (485 port)
2,402%& <STX> <ADDRESS>
Hello 650%$ <DATA>
3%& <ETX>
%q Send data packet (send buffer)
O
PERATION
When a character is received, it is compared to the start of block
character, <STX>. If it is the start character, then the very next character is
compared to the address as defined by setup parameter P251. If it
matches or if the transmitted address is 0, the controller processes all of
the subsequent data until the end of block character, <ETX>, is received.
If the received address character is not 0 and it does not match P251, then
all of the subsequent data is ignored until the next start of packet character
is received.
N P
ETWORK ROTOCOL
Each COMM port on the indicator can be set up with a unique protocol.
The COM1 port is set aside for use with the network board once the option
is installed. The protocol settings for the network board are the same as
the settings for COM1. These settings are found starting at parameter
P200.
All devices connected to the network must have matching protocol
settings.
Communications 8-53
60 Series Technical Reference Manual