Pathway LR Installers Guide - Manual (Page 11)

DMXPathfinder LR Installation & Assembly
10
PC-COM C ABLE C ONNECTION
Each Output Module is provided with an 8-position rear-mounted terminal block
for connection to the system’s personal computer. Two separate ports are
provided: an RS232 port and an RS485 port. There is also a 10VDC phantom
power supply available for powering an optional RS232/485 converter. All
connections are electrically isolated from the rest of the system, so that the PC
connection can be made without concern for ground loops or common mode
voltage problems.
Two or more PCs may be connected to a DMXPathfinder LR system
simultaneously. One can be connected to the RS232 port and another to the
RS485 port on the first Output Module, and two more to the second Output
Module, and so on. For example, say three locations are needed to connect a
PC to the system, all using RS485. If there are at least 3 Output Modules, each
of the three connections can be made at a separate module.
The following is a description of each connection from top to bottom:
CPS – Converter Power Supply, 10VDC @ 50mA
TxD – RS232 Transmit Data
RxD – RS232 Receive Data
COM – Power Supply & Signal Common
TxD+ -- RS485 Transmit Data (+)
TxD- -- RS485 Transmit Data (-)
RxD+ -- RS485 Receive Data (+)
RxD- -- RS485 Receive Data (-)
RS232/485 C OMMUNICATIONS
Each system includes an RS232-RS485 converter for optional use with the
system’s Personal Computer. The maximum cable length for RS232
connections is 50 feet (15 meters). The converter is unnecessary if the PC is
less than that distance from the Pathfinder rack. Below are the connections
required for the PC’s RS232 COM port :
Pin 1 – Carrier Detect
Pin 2 – Receive Data (connect to Pathfinder “TxD” terminal)
Pin 3 – Transmit Data (connect to Pathfinder “RxD” terminal)
Pin 4 – Data Terminal Ready