IDL 101
COMMUNICATION
HB_IDL101_E_V222.doc
59
Gantner Instruments Test & Measurement GmbH
10. COMMUNICATION
10.1. General Remarks
10.1.1. Bus Interface
The bus interface of the
Datalogger IDL 101
is a RS485 interface according to the specifications of the EIA-RS485 USA
standard.
The host interface is a RS-232 interface according to the specifications of the EIA-RS232.
10.1.2. Bus Protocol
For the
Data logger
the following transmission protocols are available.
ASCII-protocol
PROFIBUS-protocol according to DIN 19245, part 1
MODBUS-RTU-protocol acc. to Reference Guide PI-MBUS-300 Rev. D
The ASCII-protocol and the PROFIBUS-protocol can be operated simultaneously by the data loggers at the baud rates
9.6 kbps and 19.2 kbps.
10.1.3. Character Formats
The
Datalogger IDL 101
supports the following character formats:
format start
bit
data
bit
parity
bit
stop
bit
char.
length
ASCII PROFIBUS MODBUS
8N1 1 8 N 1 10 X - X
8E1 1 8 E 1 11 X X X
8O1 1 8 O 1 11 X - X
8N2 1 8 N 2 11 X - X
8E2 1 8 E 2 12 X - X
8O2 1 8 O 2 12 X - X
Table 11.1 Supported character transfer formats
The character format 8E1 with even parity (E=even) corresponds to the PROFIBUS-definitions according to DIN 19245,
part 1, and is supported by the data logger in the PROFIBUS-protocol as well as in the ASCII- and MODBUS-protocol.
This character format should thus also generally be selected for the transmission.
For modem couplings, which mostly can be carried out without a parity-bit, the character format 8N1 is available. This
character format is only supported by the ASCII- and MODBUS-protocol.
The character format is defined for the data logger via the
Configuration Software ICP 100
. If there are no specifica-
tions to the contrary, the character format is factory adjusted to even parity (8E1) on delivery of the data logger.
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