System information, Message format

System information

Message format

This section describes the messages exchanged between the "GTC link" communication interface and the external computer based on the JBUS protocol.

The length of time after which a message must be interpreted as "not understood" depends on the type of command sent.

The table opposite lists maximum response times:

Data rate	1200 Baud	2400 Baud	4800 Baud	9600 Baud
status information only	0,5 s	0,25 s	0,12 s	0,06 s

all measurements	2 s	1 s	0,5 s	0,25 s


Response time of event (independent of data rate)
- inverter start-up and connect		:	30 s

- rectifier-charger startup		:	30 s

- rectifier-charger or inverter stop		:	30 s

Example of read data array commands sent by the terminal

(address: 20H)

For the "responses", refer to the "JBUS protocol" section function 1 and 3.

request	station	function	data	length	CRC 16
		code	address
read voltage	20	03	0140	0015	82 9C
array
(21 values)
read current	20	03	0100	000F	28 03
array
(15 values)
read global	20	01	04C0	000B	7A 70
state bits
(11 bits)

Sample commands

List of variable fields

(same for all cubicle types)

The binary data and binary commands can be accessed bit or word-wise.

The word address and position of the bit in the word can be determined from the bit address:

◗hundreds and tens digit of bit address = word address;

◗least significant digit of bit address = bit position.

command	station	function	bit	data	not	CRC 16
		code	address		used
charger on	20	05	0C00	FF	00	89 DB

charger off	20	05	0C01	FF	00	D8 1B

inverter on	20	05	0C04	FF	00	C8 1A

inverter off	20	05	0C05	FF	00	99 DA

	JBUS fields	address in hexadecimal		access
		start	end
		start	end
	signaling	0	5	read / write
signaling		6	F	read
binary data		40	BF	read
commands		C0	DF	read / write
counters		E0	FF	read
currents		100	13	read
voltages		140	17	read
powers		180	19F	read
frequencies		1A0	1BF	read
battery		1C0	1DF	read
adjustments		200	2FF	read
maintenance		300	3FF	read

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