LumaSense technologies Innova Type 1314i, Инструкция по интерфейсу, Страница: 17 / 81

Chapter 1
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BB6032-14 Photoacoustic Gas Monitor LumaSense Technologies
1314i / 1412i / 1512 / 3434i Page 17 of 81
The data is transmitted in the form of ASCII codes. All ASCII codes given in
the following text are decimal numbers.
Control Lines
Pins 4, 5, 6, 8 and 20 are control lines. For control lines, RS–232 specifies
that:
•
A voltage above +3V signify the “on” state.
•
A voltage below –3V signifies the “off” state.
The use of the control lines is described in section 1.4.2 .
1.4.1 Interconnection
A null-modem cable must be used to interface the Monitor to another DTE-
coupled device (computer or printer), so that the DTEs appear to each other
to behave like modems. The null-modem cross connections which should be
used with the Monitor are given in Fig. 1.11.
Fig. 1.11 Null-modem cable details (9-pin to 9-pin connectors)
1.4.2 Interface Set-up
The Set-Up tree enables you to specify the RS-232 interface set-up of the
Monitor. The selections are :SET-UP — CONFIGURATION — SYSTEM —
COMMUNICATION — RS–232–C.
WARNING! You must partially reset the Monitor if the RS–232 configuration
is changed, for example, if the baud rate is changed. See the Instruction
Manual for details.