3. Connecting with indicators
14
SI/F (two-wire serial interface)
The M252A is equipped with a SI/F interface to connect it with UNIPULSE-manufactured digital
indicators or load cell indicators as standard. In this chapter, connection with indicators through the SI/
F is explained.
About the SI/F
The UNIPULSE's original SI/F is an interface to connect our F series indicators and printer, or
peripheral equipment, such as an external display. SI/F-compatible products can simply be connected
and used without a wareness of data content and the hardware specifications.
About the SI/F of the M252A
The M252A is equipped with a 2-ch SI/F (Ach and Bch). 6-7PIN and 8-9PIN on the rear terminal block
correspond to Ach and Bch, respectively.
Specifications of the SI/F
Connection
Two-wire, nonpolar
Transmission
distance
Parallel two-core cable: 30m
Shielded cable: 300m
Transmission
data
Measuring/metering data, status information (result of comparison, MD,
zero alarm, etc.), error information, automatic print command, etc.
Signal standards
Signal level
Photocoupler-isolated current signal
Transmission
system
Start/stop synchronous system
Transmission
speed
600bps
Data bit
8bit
Start bit
1bit
Stop bit
1bit
Parity
ODD