Thermo Scientific AutoPILOT PRO User Manual page 29

Hardware Description: Basic System
The Main Board
RS232 Mode
RS485 Mode
2-14 AutoPILOT PRO Flow Computer User Guide
If not used internally, the communication port can interface to any RS232
compatible customer device, such as a radio (see
radio options). Do not exceed +15 Vdc on any of the communication lines.
Host communication port RS232 connections are identified in the
following table.
Table 2–9. Host communication port RS232 connections
Signal
RX (Receive)
CTS (Clear to Send)
TX (Transmit)
RTS (Request to Send)
DCD (Data Carrier Detect)
GND (Ground)
Warning Customer equipment and devices must be suitable for the
location where they are to be installed.
Note For RS232 mode, do not install jumper J40.
Note For RS232 mode without DCD signal, install jumper J41.
If required, the flow computer can provide three wetting voltage sources for
the communication port:
Auxiliary +12 (TB16-6): +12 Vdc nominal, 5 mA maximum load

Auxiliary V (TB16-7): +12 V voltage, 10 mA maximum load

BO
Auxiliary +5 (TB16-9): +5 Vdc nominal, 5 mA maximum load

The host communication port also supports RS485 communication. To
use RS485 mode, jumpers J40 and J41 must be installed. Select RS485
2-wire mode by installing a jumper on J39 pins 15-16. Remove the jumper
for 4-wire mode.
For better communication quality when in RS485 mode, select the
termination through jumpers J34 and J37.
Chapter 7
TB16 on Main Board
TB16-1
TB16-2
TB16-3
TB16-4
TB16-5
TB16-8
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