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by configuring CPU Bd. Switch SW3 and/or ECOM Switch SW1 (COM6/COM9) so that the
100-Ohm termination resistors and biasing networks are installed at the end nodes and are
removed at all other nodes on the network (see Table 2-6).
(see Table 2-4A ControlWave EFM RS-485 Port Pin # Assignments)
GND/ISOGND*
* ISOGND with Isolated RS-485 Ports Only!
Note: Pins 1, 2, 3, 4 & 9 of BBI Series 3305, 3310, 3330, 3335 & 3340 RTU/DPC RS-485 Comm.
Ports are assigned as follows: 1 = TXD+, 2 = TXD-, 3 = RXD+, 4 = RXD- & 9 = ISOGND.
Table 2-6 - CPU Bd. Switch SW3 for COM3 & ECOM Bd. Switch SW1 for COM5/9
SWITCH
#
1
TX+ to RX+ Loopback
2
TX- to RX- Loopback
3
100 Ohm RX+ Termination
4
100 Ohm RX- Termination
5
N/A
6
Slew Rate
(see note 2)
ISO485 ONLY
7
RX+ Bias (End Node)
8
RX- Bias (End Node)
Note 1: Closed = Switch set ON
2.3.3.4 Piggy-back Spread Spectrum Modem (Radio) Port (see Appendix D)
An optional Spread Spectrum Modem (Radio) is available on each Expansion Com-
munications Module (mounted piggy-back) and is assigned port status as follows: COM6 for
ECOM1 and COM10 for ECOM2. There are two unique radios offered. These radios will
only communicate with their own brand of radio, i.e., FreeWave radios are not compatible
with MDS radios. DTE/DCE serial data can be clocked into (transmit) or out of (receive) the
radio at a rate up to 115.2kHz.
These radios are supplied in kit form with all the hardware required for user installation
onto an Expansion Communications Module. Figure 2-14 shows both versions of radios
mounted on the Expansion Comm. Module. Radios are user installed onto the ECOM
Module (see Figure 2-14) and their associated Ports are setup during installation in the
Ports Page of the Flash Configuration Utility. The Flash Configuration Utility is accessed
via NetView or LocalView.
FreeWave® Spread Spectrum Wireless Data Transceiver:
Operates in the 902 to 928 MHz range (20 miles).
Microwave Data System Inc. MDS TransNET OEM™ Spread Spectrum Data Transceiver:
Operates in the 902 to 928 MHz range (20 miles).
2-22 / Installation & Operation
Table 2-5 - RS-485 Network Connections
From
To 1st
Master
Slave
TXD+
RXD+
TXD-
RXD-
RXD+
TXD+
RXD-
TXD-
GND/ISOGND*
Loopback & Termination Control
RS-485 Function
Switch ON
To nth
Slave
RXD+
RXD-
TXD+
TXD-
GND/ISOGND*
Setting
ON - for Half Duplex Network or Diagnostics
ON - for Half Duplex Network or Diagnostics
ON - End Nodes Only
ON - End Nodes Only
N/A
ON - Slow Rate Enabled
OFF - Fast Rate Enabled
ON - End Nodes Only
ON - End Nodes Only
Note 2: Switch SW3 (COM3) = N/A
CI-ControlWave EFM
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