CODEL Tunnel Tech 700 Series - RS485 Interface

Technical Manual CODEL
8
Accuracy
- Visibility - ±0.002 m
-1
- CO - ±2ppm or 2% span
- NO - ±2ppm or 2% span
- NO² - ±100ppb
Power
- 24V DC, 24VA (obtained from PSU)
Communications
Serial RS485 interface via plug and socket for diagnostics, RS485 Modbus, or Codel
Protocol
Outputs
(Optional)
- analogue - 2 x 4-20mA, 200V Common
- max. load 500
- logic - 2 x volt-free contacts SPCO, 0.5A @ 125V AC,2A @ 30V DC, 0.5A @ 100V
DC (Per card, up to two cards per unit or system)
- Optional Modbus protocol serial communications (must be specified at the time of
order).

Dimensions
- Ø150mm x 260mm
3.4.
RS485 Interface (Optional)
Power
- 5V, 30mA obtained from AQM
PC Communications
- RS485 via 9-way ‘D’ connector
AQM Communication
- TTL levels
- connection via 4-way plug and socket
- isolated
Note: The AQM PCBs are equipped with built-in RS485 communications facilities for use during
commissioning. This facility may further be used after commissioning for communication to
integrate the AQM using MODBUS protocol – fuller details are contained in Appendix A.