Connect-tech Blue Heat/PCI PCI Serial Communications Instrukcja Użytkownika Pobierz pdf (Strona 41)

Blue Heat/PCI User’s Manual, Connect Tech Inc.

41 Revision 0.11

Current Source/Voltage Selection

When using the current source in a loop with low resistance, the transistor will run hot. This can

be avoided by increasing the loop resistance. The calculation for Maximum Loop

Resistance(RL ) is:

Where:

● V

= 22V when pins 2 and 3 on jumper blocks J1, J2, J3, J4 J5, J6, J7 or J8 are jumpered

● V

= 11V when pins 1 and 2 on jumper blocks J1, J2, J3, J4 J5, J6, J7 or J8 are jumpered

● S = the number of stations in the loop (TX’s and RX’s)

● V

= the voltage drop for the HP opto couplers on the SLIM. V

= 2.3 V for the HPCL

4100 and HPCL 4200. When you use other manufacturers’ equipment in the loop, the value

of V

may differ.

Note:

For most applications, jumpering pins 1 and 2 on the

appropriate jumper block (J1, J2, J3, J4, J5, J6, J7 or J8) will

be satisfactory.

Jumpering pins 2 and 3 on the appropriate jumper block (J1,

J2, J3, J4, J5, J6, J7 or J8) may be required for applications

with multiple/many loads on the Current Loop network.

J1, J2, J3, J4, J5, J6, J7, and J8 are factory set with no

jumpers installed. (Please refer to Figure 7 for the locations of

J1, J2, J3, J4, J5, J6, J7, and J8)

()

0.020

V S - V

RMax

= L

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 47

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Connect-tech Blue Heat/PCI PCI Serial Communications Instrukcja Użytkownika Strona 41