Specifications

3U Traffic Outstation Handbook
667/HB/26568/000 Page 27 Issue 15
3.9.6 RS232 Handset Interface
Type
RS232C CCITT V24 and V28
Method of Connection
Traffic Outstation – Cannon DP 25-way socket connector
Terminal Device – Cannon DP 25-way plug connector
Pin Allocation
Pin 1 – Protective ground
Pin 2 – Transmit data from terminal to controller
Pin 3 – Received data from controller to terminal
Pin 4 – Request to send
Pin 5 – Clear to send
Pin 6 – Data set ready
Pin 7 – Signal ground
Pin 9 – 5V supply (see below)
Pin 10 – 5V supply (see below)
Pin 18 – 5V supply return
Pin 19 – 5V supply return
Pin 20 – Data terminal ready
Pins 9 and 10 are connected to the Traffic Outstation’s 5V logic supply and can
supply a maximum of 250mA in total.
Bit Format
START BIT 1 2 3 4 5 6 7 PARITY STOP BIT
(SINGLE BIT) (LSB • • • • • MSB) (EVEN) (SINGLE BIT)
Baud Rate
1200, 9600 or 19200 Baud – Auto-detect
Mode
Full duplex
Character set
ISO alphabet No. 5 (ASCII)