Reference : SIG-1227-01-07
Change Note : CN0112
spYdaq Hardware Manual
Page
28
of
36
8
MODBUS RTU Registers
The spYdaq Base-station can have a MODBUS output which is compatible with many
industrial standard MODBUS packages.
MODBUS works by using a series or registers that you can either write to or read from.
Specification SIG1223-01-XX defines all the registers and their functions a copy of which
can be found on this CD.
The external Modbus connection is made via RS232 using the 9pin D-Type connector.
No handle shacking lines are implemented. All three connections below are required.
Name
Pin Description
Transmit Data
2
MISO (Master in Slave out)
Receive Data
3
MOSI (Master out Slave in)
Ground
5
Ground Connection.
Customer who require RS485 connection to the base-station should use an
Amplicon
MA485F9 converter, for more information contact the sales office
for application note AP00002. Other convertors are available but
unfortunately only the Amplicon one is supported by Signatrol.
