2920 Float & Tape Transmitter 4 Wiring
20 Installation and Operations Manual
Communications Wiring
The following table describes the wiring considerations for each communications protocol.
Terminal / Function Terminal Assignment Description
TB1 — DC Power &
Communications
B+ Positive Terminal - DC Power All Boards
C1 Bi-Phase Mark Communications
(Interchangeable - No polarity)
Bi-Phase Mark Interface
- TX1/ - RX (B) EIA-485 MODBUS
Space Mark/Space
Computer (RXD) TankWay
C2 Bi-Phase Mark Communications
(Interchangeable - No polarity)
Bi-Phase Mark Interface
+ TX1/ + RX (A) EIA-485 MODBUS
Mark Mark/Space
Encoder (TXD) TankWay
B- Negative Terminal - DC Power All Boards
TB2 — Digital Input/
Temperature Input
RTD A RTD Signal All Boards
RTD B RTD Return 1
RTD C RTD Return 2
DI2 Digital Input 2
DI COM Digital Input Common
DI1 Digital Input 1
TB3 See wiring diagrams for each order code on the following pages
TB4 GND Earth Ground All Boards
GND
TB5 HART+ Ex d HART+ (Non-I.S.) All boards, unless I.S.
HART Master I/O option
selected, and then not
used.
HART- Ex d HART- (Non-I.S.)
J1 J1 Display Interface ALL Boards
Communications Protocol Description
Bi-Phase Mark Shielded, twisted pair of 18 AWG wire is
recommended. This option provides compatibility
with Enraf (Honeywell) Bi-Phase Mark Level
products. Cable capacitance is 1 microFared (1μF)
maximum. Resistance is 200 Ohms per wire (400
Ohms per loop.)
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