INSTALLATION
2-8
FSK operation
Data for FSK operation is carried on the contacts of the AUXILIARY PORT as shown by
Table 2-1 below. The unused contacts are left unconnected.
Table 2-1 Auxiliary port contact assignments
CONTACT FUNCTION
14
Source A
−
FSK A
15
Source A
−
FSK B
16
Source B
−
FSK A
17
Source B
−
FSK B
18
Source C
−
FSK A
19
Source C
−
FSK B
12 0
V
The frequency shifts produced by the applied data are as shown in Table 2-2 below for 2FSK and
in Table 2-3 below for 4FSK.
Table 2-2 Auxiliary port inputs for 2FSK
FSK A
FSK B
SOURCE A
pin 14
pin 15
SOURCE B
pin 16
pin 17
SHIFT
SOURCE C
pin 18
pin 19
LOGIC LEVELS
1
*0
+D
0
*0
−
D
where D is the set deviation value.
*Tie FSK B as 0 or leave floating.
Table 2-3 Auxiliary port inputs for 4FSK
FSK A
FSK B
SOURCE A
pin 14
pin 15
SOURCE B
pin 16
pin 17
SHIFT
SOURCE C
pin 18
pin 19
1
0
+D
LOGIC LEVELS
1
1
+D/3
0
1
−
D/3
0
0
−
D
where D is the set deviation value.
