Network Controllers Manual 39
Specifications
Specifications
Wiring Configuration Style 7 (Class A) or Style 4 (Class B)
Communications Speed 9600 Baud, Max.
Maximum Line Resistance 100>
Maximum Line Capacitance 0.44 f
Maximum # of Electrical
Drops
32
RS-232: Wiring Configuration
Communications Speed
Style 4 (Class B)
4800 Baud, Max.
Installation
Caution: Disconnect power before removing or installing module.
The COMM-3 card plugs into connector P3 on the control module
mother board. Every control module requires a communications card.
Field Wiring
Control module mother board terminal strip TB1 is wired as follows
when a COMM-3 card is installed in mother board connector P3. Data
line 1 is used for Class B wiring, data lines 1 and 2 are both used for
Class A wiring. NO “T” tapping is permitted on the RS-485 Network
Data Lines. A maximum of 32 electrical drops is permitted on any
single RS-485 data line.
TB1-1 RS-232C Device Supervision
TB1-2 RS-232C Common
TB1-3 RS-232C Receive
TB1-4 RS-232C Transmit
TB1-5 Data Line 2 RS-485 Shield
TB1-6 Data Line 2 RS-485 (-)
TB1-7 Data Line 2 RS-485 (+)
TB1-8 Data Line 1 RS-485 Shield
TB1-9 Data Line 1 RS-485 (-)
TB1-10 Data Line 1 RS-485 (+)
Jumper Setup
JP1 End of line jumper, data line 1. Installed ONLY if the two
COMM-3 cards are physically first and last on the network
data line.
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