Instruction manual

62
13.1 Use of instruments with the RS 485 communications option
For instruments C10, M10, M300 and M400 with
the RS 485
communications option, the connection must be made using an isolated
RS 232C to RS 485 (2 wires) converter and a standard RS 232C cable.
To use instruments C10, M10, M300 and M400 with
the RS 485
communications option using an RS 232C to RS 485 converter, connect
a standard RS 232C cable between a spare port on the computer and the
RS 232C port of the converter. Connect the RS 485 terminals of the
converter to terminals 7 (+) and 8 (–) of the instrument. Please note that
the converter must be isolated and handle the RTS signal. The Athena
223A001401 RS 232C to RS 485 converters is suitable to perform this
function. The computer, converter and the instrument should be turned
off during this procedure.
For instruments M5000, X100, X400, and X5000 with
the RS 485
communications option, connect a standard RS 232C cable between the
computer and an isolated RS 232C to RS 485 converter as above. The
computer and the converter should be turned off during this procedure.
When running RS 485 cables a long distance, up to 1200 meters, a
specific data transfer cable should be used with a low capacitance per
metre. As lower is the capacitance per metre, as longer can be the cable
length. Suitable cables are as follows:
Belden type 9729 Impedance 100Ω Capacitance = 41pF/m
Belden type 9502 Impedance 150Ω Capacitance = 98pF/m
For instruments M5000, X100, X400, and X5000 with
the RS 485
communications option, connect the RS 485 terminals of the RS 232C to
RS 485 converter to the terminals of the instrument as shown in the table
below. The computer, the converter and the instrument should be turned
off during this procedure.
Controller Instrument
terminal N°
RS-485
terminal
M5000 7 +
M5000 8 -
M5000 9 Common
X100 1 +
X100 2 -
X100 3 Common
X400 1 +
X400 2 -
X400 3 Common
X5000 13 +
X5000 14 -
X5000 15 Common
For instruments M5000, X100, X400 and X5000 without
the RS 485
communications option, connect a standard RS232C cable to a spare
port on the computer and the appropriate wires to the instrument as
shown in the table below. The computer and the instrument should be
turned off during this procedure.