User`s manual

BL160092 s Sinking and Sourcing Drivers
DCIN
K
GND
485+
HC1
HC2
HC3
HC4
HC5
HC6
HC7
485–
H1
H2
H3
J2
H5
H4
J1
J3
U10
H.V. Driver
Figure D-3. Location of BL1600 Sinking Driver
Installing Sourcing Driver
Figure D-3 shows the location of the driver to be changed.
Pay particular attention to the orientation of the chip when changing the
driver. Exercise caution when installing sourcing drivers in the field.
1. Be sure power is removed from the controller.
2. Remove the ULN2003 sinking driver from the IC socket.
3. Install the UDN2985 sourcing driver chip into the IC socket.