NEMA TS 2

Description / Abstract: NEMA TS 2 covers traffic signaling equipment used to facilitate and expedite the safe movement of pedestrians and vehicular traffic.

Two approaches to expansion of traffic features of NEMA TS 1, Traffic Control Systems, are provided:

1. Type 1: Entirely new performance oriented standard.

2. Type 2: Use of the MSA, B, and C connectors in common use with NEMA TS 1 equipment.

The Type 1 approach embraces:

1. Controller Unit

a. Display-alphanumeric Display—32 Characters, 2 Lines Minimum

b. Port 1 Connector

i. High-speed full-duplex data channel connecting controller unit, conflict monitor (malfunction management unit), rear panel (terminals and facilities) and detectors.

ii. All data exchange with rear panel.

iii. Controller unit and conflict monitor exchange information on a regular basis, performing redundant checks on each other. Controller unit has access to all conflict monitor internal information, making enhanced event logging, remote intersection monitoring, and remote diagnostics feasible.

iv. All detector information, including detector diagnostics.

v. TlA-485-A serial communications interface with noise immunity characteristics.

vi. SDLC (synchronous data link) communication protocol with a bit rate of 153,600 bits/second, utilizing sophisticated error checking.

vii. Vast reduction in number of wires in the cabinet.

c. Port 2 Connector

i. Interface to personal computer.

ii. Interface to printer.

d. Port 3 Connector

i. 1200 baud, FSK serial port for on-street communications.

e. Standard Features

i. Actuated control.

ii. Conditional service.

iii. Additional detectors.

iv. Delay/extension/switching detectors.

v. Dual entry.

vi. Alternate phase sequences.

vii. Start-up flash.

viii. Automatic flash.

ix. Dimming.

x. Coordination: Sixteen timing plans; one cycle length per timing plan; one split per timing plan; three offset per timing plan.

xi. Preemption: six inputs; six sequences.

xii. Time base: yearly clock; daylight savings; leap year.

xiii. Internal diagnostics: memory diagnostics; processor monitoring; conflict monitoring checking; detector diagnostics.

2. Conflict Monitor (Malfunction Management Unit)

a. Single Type—configurable as 12 four-input channels or 16 three-input channels b. Port 1 Connector

i. Communications with controller unit, as described above.

ii. MSA, MSB connectors downward compatible with those on a TS 1 conflict monitor; used primarily for sensing of voltages on field terminals.

iii. Low voltage monitoring—monitor will be the first unit in a cabinet to sense a low voltage condition and will put intersection in flash in an orderly manner. This sequence will be reversed on power up.

c. Detectors

i. Rack mounted, 16 detector channels per rack, up to four racks.

ii. Port 1 connector: pluggable, interchangeable Bus Interface unit to convert Port 1 highspeed serial data to format required by individual detectors.

iii. Communications with controller unit, as described above.

iv. Per channel diagnostic data: open loop; shorted loop; excessive inductance change; watchdog failure.

v. Detector reset capability.

vi. Operation from either 12 volt or 24 volt DC power supply.

d. Rear Panel (Terminals and Facilities)

i. Conventional load switches, flasher, flash transfer relays.

ii. Termination points for needed functions.

iii. Port 1 connector: communications with controller unit, as described above, and pluggable, interchangeable Bus Interface Unit to convert Port 1 high-speed serial data to format required by rear panel.

The TS 2 Type 2 is the same as the Type 1 with the following exceptions:

1. The MSA, MSB, and MSC connectors for the Controller Unit are compatible with equipment conforming with NEMA TS 1-1989.

2. MS connector pin-outs are configurable to one of eight modes to satisfy different applications and achieve different functionality. Default mode is pin compatible with NEMA TS 1-1989.