To a PC for downloading data
Normally, a 9 way ‘D’ female socket to a 9 way ‘D’ female socket
lead suitable for connecting PC to PC is required. This lead
should not exceed 3 m in length. A lead is available as an
accessory, or one can be made up as follows:-
* If making up a CM500 to PC 9 Way ‘D’ lead, it may be
convenient to connect pin 4 to pin 6, enabling the lead to be used
either way round.
To a Serial Printer for printing reports
Normally, a 9 way ‘D’ female socket to a 25 way ‘D’ female
socket lead suitable for connecting PC to Printer is required. This
lead should not exceed 3 m in length. A lead is available as an
optional accessory, or one can be made up as follows;-
The printer should be set to 9600 baud, 8 bits data, no parity and
1 stop bit.
The instrument uses an isolated serial interface and takes power
from the PC or printer. This is fine for most desktop PCs and
laptops but manufacturers are working to improve the battery life
and the RS232 interface on some products has been re-
designed for low power. Low voltage and high impedance
outputs are possible.
The
CM500 requires a modest 5,5 V at 6 mA, and most of this
power is fed back into the PC or printer via the Tx (Transmit) line.
This is expected at
DTR (or RTS) and if this is not available, an
additional supply of 5,5 - 20 V with a current capability of at least
6 mA is required. This should be connected between GND (pin
5) and pin 6 on the
CM500, in place of any other connection to
pin 6.
Serial Cable Connections
30
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