Carbolite 3508 - Manual (Page 17)

Basic Operation
17 MC19-1.20
6 Options
Because options can be ordered in a variety of combinations and for a variety of purposes,
exact instructions are not given here. The full Eurotherm manual may be required to
determine customer parameter settings. To reveal or hide parameters in the controllers it is
necessary to go into configuration modes, a security code is needed. Please consult
Carbolite.
6.1 Digital Communications
– RS232
If the RS232 option is supplied, then the furnace or oven is fitted with one subminiature D-
socket connected to the controller communications (comms) module. RS232 is suitable for
direct connection to a personal computer (PC), using a “straight through” cable as follows
(the linked pins at the computer end are recommended but may not be necessary). The
cable is usually 9-pin at the furnace or oven end and 9-pin at the computer, but other
alternatives are shown in parentheses.
Furnace end of cable RS232 Cable: furnace to PC Computer end of cable
female 9-pin (25-pin) 9-pin (25-pin) male
Rx 3 (2) 3 (2) Tx
Tx 2 (3) 2 (3) Rx
Com 5 (7) 5 (7) Com
7,8 (4,5) Link
together
1,4,6 (6,8,20) Link
together
6.2 Digital Communications – RS485
If an RS485 option is supplied, then the furnace is fitted with two D-sockets. Connection
between products is by “straight” cable as follows:
RS485 cable: furnace to
furnace
female 9-pin (25-
pin) 9-pin (25-pin) female

3 (2) 3 (2)

+ 2 (3) 2 (3) +
Co
m 5 (7) 5 (7) Com
If a boxed KD485 RS485 to RS232 converter is supplied, then the connection cable from
furnace to KD485 should be a “straight” cable, the same as the furnace-to-furnace cable.
The connection between the KD485 and the PC should be a “crossover” cable, the same as
the Furnace to PC cable in section 6.1.
6.3 Comms Address
Typically the comms address is set to 1, but this can be changed. In the case of RS485 and
multiple instruments it is necessary to set different addresses.