Mesa 7I37, Manual, Page: 11 / 16

7I37 8
CONNECTORS
TERMINAL BLOCK ISOLATED I/O CONNECTORS
TB2
PIN FUNCTION DIRECTION PIN FUNCTION DIRECTION
1 IBIT1+ TO 7I37 2 IBIT1- TO 7I37
3 IBIT3+ TO 7I37 4 IBIT3- TO 7I37
5 IBIT5+ TO 7I37 6 IBIT5- TO 7I37
7 IBIT7+ TO 7I37 8 IBIT7- TO 7I37
9 IBIT9+ TO 7I37 10 IBIT9- TO 7I37
11 TO 7I37 12 IBIT11- TO 7I37
13 TO 7I37 14 IBIT13- TO 7I37
15 TO 7I37 16 IBIT15- TO 7I37
17 OBIT1+ FROM 7I37 18 0BIT1- FROM 7I37
19 OBIT3+ FROM 7I37 20 OBIT3- FROM 7I37
21 OBIT5+ FROM 7I37 22 OBIT5- FROM 7I37
23 OBIT7+ FROM 7I37 24 OBIT7- FROM 7I37
TERMINAL BLOCK KEYING
The I/O terminal blocks on the 7I37TA are supplied with three 8 pin screw terminal
plugs. To prevent accidental misconnection if wired plugs are removed and replaced. It
may be desirable to key the plugs so they can only be inserted in their proper receptacle
location. The screw terminal plugs are keyed by clipping certain of the small green
polarizing tabs on the screw terminal plugs and installing blocking plugs (these are thin
orange plastic pieces) in the corresponding slot in the receptacle. A suggested keying
pattern for TB1 is keys at pins 2, 8, 12, 16, 21, 24 and for TB2 is keys at pins 1, 4, 9, 13,
17, 22.