Watlow PPC-2000 - Manual (Page 107)

PPC-2000 User’s Guide Chapter 2: Hardware Installation
Doc.# 30002-00 Rev 2.3 Watlow Anafaze 83
Table 2.30 485 Terminal Block Pin Assignment
Cable Recommendations
Watlow Anafaze recommends Belden #9843 or its equivalent.
This cable includes three, 24 AWG, shielded, twisted pairs. It
should carry signals of up to 19.2 kbaud with no more than
acceptable losses for up to 4000 feet.
RS-485 Network Connections
Run twisted pair from the host or converter to a 485 terminal
block as close to first PPC as possible, and from that point to
another 485 terminal block near the next PPC, and so on.
Connect 485 terminal blocks in series using appropriate
lengths of 485 cable. Be sure to connect all five conductors at
each junction such that the 485 terminal block at each PPC will
see the same signals on each of its pins.
Install the 485 terminal blocks as close to each PPC as possible.
To avoid unacceptable interference, use less than ten cable feet
from the terminal to the PPC serial port.
Use cables with RJ12 plugs to connect from the 485 terminal
blocks to the serial ports on each PPC-2010, or use cables with
bare wires on one end and RJ12 connectors on the other to
connect from terminal strips to the PPCs.
Two Wire RS-485 Connections
By placing jumpers between the (+) pins and between the (-)
pins on the 485 terminal blocks, RS-485 systems may be
configured for two wire connections as well. Use the same
cables with RJ12 plugs as you would use for four wire
connections to connect from the 485 terminal blocks to the
serial ports on each PPC-2010. Connect the two wire RS-485
network to the 485 terminal block according to Figure 2.72.
485 Terminal
Block Pin
Number
PPC-2010 485
Port Pin Number
Function
1 1 Common
2 2 RB +
3 3 TB +
4 4 TA -
5 5 RA -
6 6 Not used
S Not used Not used