Mitsubishi A Series - 2. SYSTEM CONFIGURATIONS

3.5.6 DC2/DC4 receive contrd .......................................... 3-32
3.6
I/OSignalsListfOfCPU .................................................. 3-33
3.7
Buffer Memory Applications and Allocation .................................. 3-36
4 . SElllNGS AND PROCEDURES BEFORE OPERATION .................. 4 . 1 . 4 . 21
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
Settings and Procedures More Operah'on .................................. 4 . 1
Nomenclature .......................................................... 4 . 2
4.2.1
Nomenclature .................................................... 4-2
4.2.2
LED signals and displays .......................................... 4-3
Settings ............................................................... 4-5
4.3.2
Setting of transmission specifiiions. main channels.
andterminalresistance ............................................ 4-6
4.3.3
Station number setting ............................................ 4-9
Loadingandlnstallation ................................................. 4-10
4.4.1
Handling instructions ............................................ 4-10
4.4.2
Installation environment .......................................... 4-10
Externalwiring ........................................................ 4-11
4.5.1
Precautionsduringwiring ......................................... 4-11
4.5.2
Connecting the RS-232C connectors ............................... 4-11
4.5.3
Connecting the RS422 connectors ................................. 4-13
4.3.1 Setting the dedicated protocol. no-protocol mode. or bidirectional mode ... 4 - 5
4.5.4 Connecting a muitidrop link and setting modes and terminal resistance ... 4 - 14
Self-loopback Test ..................................................... 4-17
4.6.1 Proceduretocarryouttheself-loopbacktest ......................... 4-17
4.6.2
Setf-loopback test operations ...................................... 4-19
InspectionandMaintenance ............................................. 4-21
LWpbaCkTest ........................................................ 4-20
5 . HALF-DUPLEX COMMUNICATIONS USING THE RS-23X INTERFACE ...... 5 . 1 . 5 . 9
5.1 System Configurations and Functions ...................................... 5 . 1
5.2 Buffer Memory Settings .................................................. 5-2
5.3 Wiring ................................................................ 5-3
5.4 ON/OFF Timing of the CD and RS Signals of the AJ71C24 ..................... 5-4
5.4.1
Data transmission timing from an external device ...................... 5-5
5.4.2 Data transmission timing from an A171 C24 ........................... 5-7
6 . DATA COMMUNICATIONS USING AN M : N MULTIDROP LINK ........... 6 . 1 6 . 11
6.1 KeyPoints .............................................................. 6-1
6.2
Conditions for Computer Interlock .......................................... 6-2
6.2.1
Computer station number allocation ................................... 6-2
6.2.2
Maximum data communications time per computer ...................... 6-3
6.2.3
Command and message format for data communications
amongcomputers ................................................. 6-4
6.3
Procedure for Data Communications with a PC CPU ........................... 6-5
6.3.1
Communications between each computer and PC CPUs ................. 6-5
6.3.2
Data communications with PC CPUs by setting a master station and
slavestations ..................................................... 6-8
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