Mitsubishi A Series - 1. GENERAL DESCRIPTION; 1.1 Features

CONTENTS
1. GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1 1 - 10
1.1 Features .. .. . . . . ........................ . .... . ...... .............. .... 1-4
1.1.1 Control operations in data communications . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 4
1.1.2
System configuration and the number of stations when a computer
link system
is constructed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . , . . , . . . . . . 1 - 7
1.1.3
Link with a computer through data link systems . . . . . . . . . . . . . . . . . . . . . . . . 1 - 9
1.1.4
Modeswitchingfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , , . 1 - 10
1.1.5
Transmission control function . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . , 1 - 10
2 SYSTEM CONFIGURATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1 - 2 - 21
21 Overall Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . 2- 1
2.3 System Configurations and Available Functions . . . . . . . . . . . . . . . . . . . . . . , . . . . , . . 2 - 4
23.1 1 : 1 ratio of an external device (computer) to a PC CPU . . . . . . . . . . . . . . . . . 2 - 4
23.2
1 : n ratio of an external device to PC CPUs . . . . . . . . . . . . . . . . . . . . . . . . , . . 2- 7
23.3 2:
1 ratioofextemaldevicestoaPCCPU ......... . . .............. ,. 2-10
2.3.4
2:nratioofextemaldevitoPCCPUs ............................ 2-13
2.3.5
m:nratioofextemaldevicestoPCCPUs ... ........................ 2-16
23.6
Links with an external device (such as a computer)
through data link systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . , . . , . . , . 2 - 19
2.2
, ApplicableSyst~~~~ ..................................................... 2-2
3.1 GeneralSpeCificati . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . 3-1
3.2
Perf~nnan~eSpeCificatiOns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . , , 3-2
3.2.1
Transmbsionspecifications.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.3
RS422 terminal Mock specifiions . . . . . . . . . . . . . , . . . . . . . . . . . . . . . , . , . 3 - 5
3.3 Data Communications Functions . . . . . . . . . . . . . . . . . . . . . . . . . . , , . . . . , . . . . . , , , . , 3 - 6
3.3.1
Functions available using dedicated protocots and commands . . . . . . , . . . , 3 - 6
3.3.2
Functions available in the no-protocol mode . . . . . . . . . . . . , . . . . , . . . . , . . , 3 - 13
3.3.3
Functions available in the bidirectional mode . . . . . . , . , , . , , . . , . . . . . . . , . 3 - 14
3.3.4
Transmission error data read function . . . . . . . . . . . . . . , . . . . , , . . , . . . . . . . 3 - 15
3.4
Mode Switching Function During A171 C24 Operations . . . . . . . , , , , , . . , . . , . . . . . , 3 - 16
3.4.1
Precautions when mode switching . . . . . . . . . . . . . . . . , . . . , . . . . . . . . . . , . 3 - 16
3.4.2
Procedure for switching the mode from an external device . . . . . . . . . . . . . . 3 - 20
3.4.3 Procedure for switching the mode from a PC CPU . . . . . . . . , . , . . , . . , . , . . 3 - 22
3.5 Data Communications Transmission Control Function . . . . . . . . . . . . . . . . . , . . . , . . 3 - 24
3.5.1
Precautions when controlling transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 24
3.5.2
DTR /DSR (EWDR) control. . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . , . . , . . . . 3 - 28
3.5.3
DCl/DC3 transmission control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . 3 - 30
3.5.4 DCl/DC3 receive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 3 - 31
3.5.5
DC2DC4sendcontrol ............................................ 3-32
3.2.2
RS-232CCOnnectOrspecificati ... .. ... . . . . . . . . . . .. . . . .. . . . . . . . . . . 3-3
3.2.4 RS422caMe~pecifications.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . , , 3-5
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