Bacnet Ptp - Roberts Gorden CORAYVAC Installation Manual

• If RX LED is solid, then the terminations are incor-
rect.
• If the network has greater than 32 devices or
exceeds 2000' (610 m) a Repeater should be
installed.
• If a controller begins or ends a network segment,
a terminating resistor may be needed.

12.3 BACnet PTP

PTP is used to connect 2 distinct BACnet networks
so that information can be shared between the
networks. PTP uses an EIA-232 connection between
2 BACnet half-routers. This connection allows for 2
different BACnet networks to speak to each other,
even at different baud rates.
To set up the Modulating Controller for BACnet
PTP
1. Turn off power to control board.
2. Using the rotary switches, set the controller's
address. Set the Tens (10's) switch to the tens digit
of the address and set the Ones (1's) switch to the
ones digit. See Page 36, Figure 19.
3. Set the Selector DIP Switches 4 and 5 for the
appropriate communications speed (9600, 19.2k,
38.4k, or 76.8k bps).
4. Set Comm Selector DIP Switch 3 to ON for Port 2.
Note: Comm Selector DIP Switch 4 (Port 1) will be
set by the manufacturer.
5. Set the DIP Switch Selector 6-8 for BACnet PTP.
The following example shows the DIP Switches set
for 38.4k, Port 2, and BACnet PTP.
SECTION 12: I
NTEGRATION WITH
6. Connect the communications wiring to Port 2a.
Wire Specifications
• 18–28 AWG; twisted pair preferable
• 50' (15.24 m) maximum length
For more wire specifications See Section 6.
Note: Do not power the device from the same
transformer that powers controller.
7. S
ee table below to wire control board to a modem.
Modem (25- Null
pin) Modem
Null Modem Cable
Cable (9-pin)
TX - pin 2 TX - pin 3
RX - pin 3 RX - pin 2
DTR - pin 20 DTR - pin
4
DCD - pin 8 DCD - pin
1
GND - pin 7 GND - pin
5
8. Set the following DIP switch on the modem.
Note: US Robotics External Modem is highly
recommended.
B M S (BMS)
UILDING ANAGEMENT YSTEM
S2-DB9 Device
(9-pin) (5 pin)
TX - pin 3 TX - pin 1
RX - pin 2 RX - pin
2
DTR - pin DTR - pin
4 3
DCD - pin DCD -
1 pin 4
GND - pin GND -
5 pin 5
93