Warning, Caution – Measurement Computing LogBook Series User Manual
Page 78
5-2 LBK and other non-DBK Options
919495
LogBook User’s Manual
LBK/COM/422/485
The standard LogBook communications board supports RS-232 only; but as an option, the LogBook can
be purchased with the additional capability for RS-422 and RS-485. These optional boards
(p/n LBK/COM/422/485) have circuitry for three communication protocols. If your communication board
has the RS-422/485 option, you can switch between RS-232 and RS-422/485 by switching the board’s
orientation in the CN8 slot.
SERIAL COM pinouts for RS-232 and RS-422 / RS-485 are included on the following page.
WARNING
Electric shock hazard. Turn off power to all system-connected devices prior to
connecting or disconnecting cables, or setting hardware configurations. Failure to
do so could result in electric shock or death, and equipment damage, even under
low-voltage conditions.
CAUTION
Perform the following procedure using ESD tools, containers, and procedures. One
or more related components are sensitive to damage from electrostatic discharge.
1. Turn off system power.
2. Remove the LogBook’s top cover and locate CN8 (see figure for location).
3. Remove the RS-232/485 board from CN8. Note that CN8 has two release clips.
4. Rotate the RS-232/485 board to a relatively upside-down position, and insert back into CN8. Note
that onboard text indicates which end should be up for a given communication option, i.e.,
RS-232
↑ UP ↑, or RS-485 ↑ UP ↑.
5. For RS-485 applications, ensure the address setting on rotary switch SW2 is unassigned; and change
the address if needed. See note.
6. Replace the top cover and screws.
7. Turn on system power.
Notes:
(1) The CN8 slot has two release
clips that must be depressed
to release the COM card.
(2) The COM Card has onboard
text, indicating orientation, as
follows:
“RS-232
↑ UP ↑”
“RS-485
↑ UP ↑”
The LBK/COM/422/485 Card
inserts into the CN8 slot on
LogBook’s Motherboard.
LogBook Motherboard, CN8 Location Reference
For RS-485 applications, rotary switch SW2 sets the address.
SW2 is located next to CN8, just inside the PC-Card door. Use a
small flat-head screwdriver to set a particular address (1 of 16) in a
multi-drop RS-485 network. Rotate the switch so the black dot aligns
with the desired, previously unassigned, address.