• Avoid touching the electronic boards. If these are removed for any reason -
SWITCH OFF the instrument FIRST.
• DO NOT HANDLE without ANTI-STATIC precautions being taken.
2.4 Serial I/O (RS232C)
An industry-standard serial port is fitted which allows the analyser to be connected to a wide
range of computer equipment for logging and remote control. The connector is similar to an
‘AT’ style PC serial port allowing the use of standard cables.
The serial port is configured from the front panel – see section 3.7.2. The serial port protocol is
detailed in section 3.7.1.
Serial (RS232C) Port Connections
Pin Name Function
1 - no connection
2 Rx Received data (input)
3 Tx Transmitted data (output)
4 DTR Handshake for Rx (output)
5 ground 0V (nominally chassis)
6 - no connection
7 RTS ‘true’ whenever unit is powered
8 CTS Handshake for Tx (input)
9 - no connection
Notes:
1. DTR is normally ‘true’
2. CTS is monitored only when ‘hardware handshake’ is selected
3. Screened cables must be used for RS232 connections
In common with all RS232C ports, long cable runs can cause problems with data corruption and
noise. Keep cables as short as practicable as – certainly no longer as 30 meters at 9600 baud.
Route signal cables well away from power cables, switchgear and other noise sources. For long
cable runs, and in electrically noisy environments, optical RS232C cable extenders are
recommended. Contact ADC (Spares & Service) Ltd. or their local authorised agents for advice.
2.5 Analogue Outputs
Analogue outputs are provided for connection to chart recorders, remote meters, analogue
logging equipment etc. Up to four outputs are available; one for each gas reading.
The outputs are arranged so that the reading shown at the top of the screen is presented on
analogue output 1, the reading on the next line down (if any) is presented on output 2 and so
on. Where there are fewer than four gas readings, unused analogue outputs will be inactive or
not fitted.
The analogue outputs are available via a circular ‘DIN’ connector on the rear panel, labelled
‘OUTPUTS’. A suitable connector is provided in the kit with each instrument, and further
supplies are available from ADC (Spares & Service) Ltd. or their authorised local agent.
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