RKC INSTRUMENT PG500, Инструкция по эксплуатации системы связи

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IMR02F04-E1
i-3
CONTENTS
Page
1. OUTLINE ............................................................................... 1
2. HOST COMMUNICATION .................................................... 2
2.1 Host Communication Specifications ................................................................ 2
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RKC communication ...................................................................................................... 2
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Modbus ......................................................................................................................... 3
2.2 Wiring for Host Communication ....................................................................... 4
2.2.1 Connection to the RS-485 port of PG500 ................................................................... 4
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Communication terminal number and signal details (RS-485) ....................................... 4
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Connection to the RS-485 port of the host computer (master) ...................................... 4
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Connection to the RS-232C port of the host computer (master) .................................... 5
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Connection to the USB of the host computer (master) .................................................. 6
2.2.2 Connection to the RS-422A port of PG500 ................................................................ 7
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Communication terminal number and signal details (RS-422A) .................................... 7
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Connection to the RS-422A port of the host computer (master) .................................... 7
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Connection to the RS-232C port of the host computer (master) .................................... 8
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Connection to the USB of the host computer (master) .................................................. 9
2.3 Setting ........................................................................................................... 10
2.3.1 Display sequence ..................................................................................................... 10
2.3.2 Description of each parameter ................................................................................. 11
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Function block 60 (F60.) [Engineering mode] .............................................................. 11
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Setup setting mode ..................................................................................................... 11
2.3.3 Setting Procedure Example ..................................................................................... 12
2.4 Communication Requirements ...................................................................... 16
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Processing times during data send/receive ................................................................. 16
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RS-485 (2-wire system) send/receive timing (RKC communication) ........................... 17
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Fail-safe....................................................................................................................... 17
3. RKC COMMUNICATION PROTOCOL ............................... 18
3.1 Polling ............................................................................................................ 18
3.1.1 Polling procedures ................................................................................................... 19
3.1.2 Polling procedure example (When the host computer requests data) ...................... 22
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Normal transmission .................................................................................................... 22
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Error transmission ....................................................................................................... 23
3.2 Selecting ........................................................................................................ 24
3.2.1 Selecting procedures ............................................................................................... 24
3.2.2 Selecting procedure example (When the host computer sends the set values) ....... 27
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Normal transmission .................................................................................................... 27
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Error transmission ....................................................................................................... 27
4. MODBUS COMMUNICATION PROTOCOL ....................... 28
4.1 Message Format ............................................................................................ 28
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Slave address .............................................................................................................. 28
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Function code .............................................................................................................. 28
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Data ............................................................................................................................. 28
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Error check .................................................................................................................. 28