3.9.1
Digital Communications - RS232
If the RS232 option is supplied, the furnace is fitted with one sub-miniature D-
socket connected to the controller 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 end and 9-pin at the computer, but other
alternatives are shown in parentheses.
Product end of cable
female (25-pin) 9-pin
RS232 Cable:
product to PC
Computer end of cable
9-pin (25-pin) male
Rx
(2)
3
_________________
3
(2)
Tx
Tx
(3)
2
_________________
2
(3)
Rx
Com
(7)
5
_________________
5
(7)
Com
7,8
(4,5)
Link together
1,4,6
(6,8,20)
Link together
3.9.2
Digital Communications - RS485
If an RS485 option is supplied, the furnace is fitted with two D-sockets. Connection
between products is by “straight” cable as follows:
Product end of cable
female (25-pin) 9-pin
RS485 Cable:
product to PC
Computer end of cable
9-pin (25-pin) female
-
(2)
3
3
(2)
Tx
+
(3)
2
2
(3)
Rx
Com
(7)
5
_________________
5
(7)
Com
3.9.3
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. To change the
address value, access the level 2 list. In level 2 press the page key until the COMMS
parameter is displayed. Press up
down
to select the address value.
3.9.4
Alarm Option
When an alarm board is fitted, which consists of a relay with voltage free contacts, for
operator use, the contacts are taken to a panel plug on the control panel, wired as
indicated:
31
3.0 3508 Controller