NEMA TS2 Bus Interface Unit BIU-700 User Manual

: June 8, 2024
: EDI

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NEMA TS2 Bus Interface Unit
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NEMA TS2 Bus Interface Unit

Operations Manual

THIS MANUAL CONTAINS TECHNICAL INFORMATION FOR THE BIU-700 SERIES BUS INTERFACE UNIT, PCB ISSUE D.

REVISION: January 2012

pn 888-0700-002

BIU-700

Section 1 General

1.1 OVERVIEW

The NEMA TS-2 Bus Interface Unit (BIU) performs the interface between Port 1 at the Controller Unit (CU) and the Terminals and Facilities (TF), Loop Detector Rack(s), and other devices. Its functions include controlling load switch outputs, communicating with Inductive Loop Detectors and other devices, and the conditioning and conversion of TF and Loop Detector Call outputs for the CU.

The BIU-700 series Bus Interface Unit meets all requirements and performs all functions required by the NEMA TS2-2003 standard for the BIU configuration. The BIU-700 determines its operational mode based on the Address Select inputs. These inputs are prewired in the TF or Detector Rack such that there is no user programming required in installing the BIU-700.

1.2 CONFIGURATIONS

The BIU-700 model is provided as a BIU configuration (see TS2-2003, clause 8.3). The BIU-720, BIU-730, and BIU-740 models can be configured to meet the BIU2 configuration as defined by TS2-2003, clause 8.3. These models provide detector rack communication capabilities and an optional front panel EIA-232 or Ethernet communication port. Consult the factory for details.

The BIU-700H is a half-width version of the standard BIU-700 model intended for use in racks where space is a premium.

1.3 FRONT PANEL INDICATORS

1.3.1 POWER INDICATOR

The POWER indicator will illuminate when the DC power to the unit is greater than 18 VDC.

The POWER indicator will extinguish when the DC power to the unit is less than 16 VDC.

1.3.2 PORT1 RX INDICATOR

The Port 1 Rx indicator is used to indicate SDLC Port 1 activity. The Rx indicator will illuminate for 40 milliseconds each time a valid command frame is correctly received from the CU.

1.3.3 PORT1 TX INDICATOR

The Port 1 Tx indicator is used to indicate SDLC Port 1 activity. The Tx indicator will illuminate for 40 milliseconds each time a valid response frame is transmitted by the BIU700 to the CU.

Section 2 IO Specifications

2.1 POWER REQUIREMENTS

The BIU-700 requires a nominal supply voltage of 24 VDC ± 2 VDC. A voltage of 16 VDC or less is considered loss of power and a voltage of 18 VDC or more is considered adequate for operation. On initial application of power, current draw is limited to a maximum of 1.25 amperes peak. Upon reaching steady state, the BIU-700 requires no more than 200 mA over the voltage range of 16 to 30 VDC. The BIU-700 may be plugged in or unplugged while under power without the risk of damage.

2.2 INPUTS

2.2.1 LOGIC INPUTS

The BIU-700 provides 8 dedicated inputs and 24 configurable I/O lines. An input voltage less than 8 VDC is considered the Low (True) state, and a voltage greater than 16 VDC is considered the High (False) state. Over the range of 0 to 26 VDC the input current in or out does not exceed 10 mA. The Input impedance to 24 VDC is typically 10 K Ohms.

2.2.2 OPTO-ISOLATED INPUTS

The BIU-700 provides 4 dedicated optically isolated inputs. Each opto-input provides at least 10 M Ohms resistance and 1000 VAC RMS minimum breakdown to all connector pins except the opto common pin. These inputs exhibit a nominal impedance of 5 K Ohms. An input voltage of 3 Vrms or less is False and 8 Vrms or greater is True.

2.3 OUTPUTS

The BIU-700 provides 15 dedicated outputs and 24 configurable I/O lines. The Low (True) state will drive an output voltage to less than 4 VDC while sinking up to 50 milliamperes. With an external impedance of 100 K Ohms or greater the output will transition from 4 to 16 VDC in less than 0.1 milliseconds. High (False) state impedance is typically 10 K Ohms to 24 VDC.

2.4 SDLC PORT 1

The Port 1 connector is a 15 pin metal shell “D” sub miniature type. The connector provides female contacts with 15 millionths of an inch minimum gold plating in the mating area. The connector intermates with a 15 pin D type connector, Amp Incorporated part number 205206-1, or equivalent, which is equipped with spring latches, Amp Incorporated part number 745012-1, or equivalent.

2.4.1 PORT 1 CONNECTOR PIN ASSIGNMENTS

NOTE: Tx pins at the BIU = Rx pins at the CU; Rx pins at the BIU = Tx pins at the CU.

Pin Function