Watlow Series 734 Data Communications - Manual (Page 7)

7
WATLOW Series 733/734 How to Use Data Communications
Configuration
Figure 4 -
Internal EIA/TIA-422
& EIA/TIA-423 Switch
Location and Selec-
tion.
˜
NOTE:
The Series 733/734
leaves the factory
configured for
EIA/TIA-423 opera-
tion, unless other-
wise requested.
How to Set the EIA/TIA-422 & EIA/TIA-423 Hardware
Protocol Switches for 73xx-xxxx-xBxx Units Only
The EIA/TIA-422 or EIA/TIA-423 switches are on the Communication Module Board
(A007-1830) inside the control. Figure 4 shows the approximate location of this
board. Select C1 on both switches for EIA/TIA-423, or C2 on both switches for EIA/
TIA-422 operation. Both switches must be set to the same position.
To change the position of the switches:
Watlow recommends using a properly grounded wrist strap before opening
this control.
1) Remove power from the Series 733/734.
2.
Remove the two snap-on connectors from the back of the unit.
2) Remove the two rear cover screws from the back of the unit.
3) Remove the rear cover and locate the switches. See Figure 4.
4) Set both switches to C1 for EIA/TIA-423, or to C2 for EIA/TIA-422
5) Replace the rear cover; secure the two rear cover screws.
6.
Re-attach the two snap-on connectors.
7. Apply power to the control.
Your Computer's Serial Interface:
The Key To Network Connections
You can connect a data communication-equipped Series 733/734 to any computer
with an EIA/TIA-422 or EIA/TIA-423 (EIA/TIA-232 compatible) or EIA/TIA-485 serial
interface. The IBM™PC® with an EIA/TIA-232 serial output card, for instance, will
talk to a single EIA/TIA-423 equipped Series 733/734. For a multiple 733/734
network with the same PC, you'll need an EIA/TIA-232 to EIA/TIA-422 converter to
act as a "bus," or multiple connection point.
Watlow recommends the Burr-Brown LDM 422 for that purpose. The address is:
Burr-Brown, Inc., 1141 West Grant Rd,. Suite 131, Tucson, AZ 85705,
Phone: (602) 624-2434, Fax: (602) 623-8965.
For EIA/TIA-485, we recommend the Black Box LD485A-MP. The address is:
Black Box Corp., Mayview Road at Park Drive, Box 12800, Pittsburgh, PA 15241,
Phone: (412) 746-5530, Fax: (412) 746-0746.
Communications Board
EIA/TIA-422 (C2) ← → EIA/TIA-423 (C1)
Series
733/734
(rear view)