Toshiba AS311 - Manual (Page 6)

4
ASCII Interface Module (AS311)
Contents
Contents
Safety Precautions .................................................................................. 1
About This Manual .................................................................................. 2
1.
AS311 Overview .......................................................................... 7
1.1
Introduction ...................................................................................... 8
1.2 AS311 functions ............................................................................... 9
1.3 External features .............................................................................. 10
2.
Specifications ............................................................................ 15
2.1
General specifications ...................................................................... 16
2.2 Functional specifications ................................................................ 16
2.3 Transmission specifications ............................................................. 17
3.
Cable Connections ..................................................................... 19
3.1
RS-232C connection ......................................................................... 20
3.2 RS-422 connection ............................................................................ 21
4.
Register Configuration .............................................................. 23
4.1 I/O allocation and I/O registers ........................................................ 24
4.2 AS311 buffer memory ........................................................................ 26
4.2.1 Memory map ............................................................................... 26
4.2.2 Buffer memory access ................................................................ 27
4.2.3 Parameter area ............................................................................ 29
4.2.4 Receiving and transmitting data area .......................................... 36
5.
Operation Procedure ................................................................. 37
5.1 Transmission message format .......................................................... 38
5.2 Received message read sequence .................................................. 39
5.2.1 Flag control timing ....................................................................... 39
5.2.2 T3 sample program for message receiving ................................... 40
5.3 Write sequence for message transmitting ....................................... 43
5.3.1 Flag control timing ....................................................................... 43
5.3.2 T3 sample program for message transmitting ................................ 44
5.4 Checking the AS311 operation status .............................................. 47
5.5 Resetting the AS311 by software ...................................................... 48
5.6 Setting the trailing code .................................................................... 49
5.7 Setting the time-out check time ........................................................ 50