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User’s Manual
17
2. Specifications
2.3 Transmission specifications
Item Channel 1 Channel 2
Interface RS-232C or RS-422 RS-232C
Transmission mode Full-duplex
Synchronizing Start-stop method (asynchronous)
Transmission speed 300, 600, 1200, 2400, 4800, 9600, 19200 bps
Frame format Start bit
Data
Parity
Stop bit
1 bit
7 or 8 bits
even / odd / none
1 or 2 bits
Transmission code ASCII
Message length Max. 896 bytes
Configuration One to one (Note)
Transmission distance Max. 15 m (RS-232C)
Max. 1 km (RS-422)
Max. 15 m
Connector D-sub 25-pin female D-sub 25-pin female
Note) In case of RS-422 interface, multiple devices can be connected to one AS311
if the connected RS-422 devices work as slave stations and support multi-point
connection. That is, the connected RS-422 devices must have the transmission
generators which support the passive state. Also, the RS-422 devices must
support the message format which contains the selecting address. In this case,
the number of the connected RS-422 devices is limited up to 10.
On the other hand, the AS311’s transmission generator does not support the
passive state. Therefore the AS311 must be the master station in the one-to-N
configuration.