Qualitrol 509ITM Series, Manual

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Communications
The monitor comes equipped with digital communication capabilities. A four-wire, RS-485
connection is located on the back of the monitor. See the Four-Wire RS-485 Connection
figure. If the operator is using a two-wire, RS-485 connection with the 509 ITM, short
TXD+(B) with RXD+(B)(TB2-9 &11), and TXD-(A) with RXD-(A)(TB2-10 & 12), then connect
the two-wire, RS-485 as an A/B system. There is also an option for a fiber optic connection.
This option has been tested using both the Black Box fiber optic modem line driver
#ME540A-ST and the Dymec line/repeater #5846-F-ST. See the Optional Fiber Optic
Connection figure for the connection to this option. The RS-485 connection may be used
with the Qualitrol Remote Software Package and other available protocols. Refer to the
Software Instructions and the 509 Communications Manual, IST-100-X, for a complete
description of these features. For specific options and/or options for a special
communications protocol, contact Qualitrol or our authorized representative.
NOTE: TB2-
13 and TB2-16 are communication signal grounds. They should never be connected to
Earth Ground.
Four-Wire RS-485 Connection
Optional Fiber Optic Connection