Catalogs > Industrial Controls Catalog > Relays, Timers, and Temperature Controllers > Single Loop Temperature/Heater Controllers > Bulletin 900-CONV
Bulletin 900-CONV
| Introduction |  |
Standards Compliance and Certifications | |
Product Selection | |
Specifications | |
Approximate Dimensions | |
External Connections | |
Bulletin 900-CONV Front Display/Operations | |
RS-485 Connection
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⋆ If RS-485 is selected as the communications method (i.e., pin 9 of the DIP switch is set to OFF), terminals 8 and 9, and terminals 11 and 12 are connected internally.
‡ A 100…240 V AC, 24 V AC, or 24 V DC (not polarity sensitive) input power supply is required.
| Function | Terminal Number | Name | Signal Direction | Explanation |
| For connecting the operating power supply | 1 and 4 | PWR | — | 100…240V AC or 24 V AC/DC model |
| Connection terminals for RS-232C communications with master device (DIP switch pin 8: OFF) | 3 | SG | — | Connect to signal ground. |
| 5 | SD | Input | Receives data from SD of the master device. | |
| 6 | RD | Output | Sends data to RD of the master device. | |
| Used for RS-485 communications with slave device (DIP switch pin 9: OFF) | 8 | RDA (–) | Input/ output |
SD and RD for RS-485 (cold side) Terminals 8 and 9 are connected internally when pin 9 of the DIP switch is set to OFF. |
| 9 | SDA (–) | |||
| 11 | RDB (+) | Input/ output |
SD and RD for RS-485 (hot side) Terminals 11 and 12 are connected internally when pin 9 of the DIP switch is set to OFF. |
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| 12 | SDB (+) | |||
| Note:Terminals 2 and 10 are not used. | ||||
Connection to an RS-232C Master Device
Set the same communications conditions (baud rate, stop bits, data length, and parity) for the master device, the Interface Converter, and slave devices.
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§ With RS-485 communications, connect a terminating resistance (120W, 1/2 W recommended) to both ends of the communications link/network.
♣ The Bulletin 900-TCx communications number must be set.
∆ A pre-fabricated 3 m RS-232 cable with a 9-pin female D-shell connector on one end and three flying leads at the other is available from Allen-Bradley (Cat. No. 900-CP1X).
♦ RS-485 allows connecting 32 devices.
♠ Use a commercially available USB cable
∇ To use the USB mode requires the download of "free" software into your PC. This software can be found at: http://ab.rockwellautomation.com/Sensors-Switches/Temperature-Sensors/900Builder-Lite-Temperature-Controller-Software
Terminal Specifications
Make sure to check the input and output specifications for the signal pins of connected devices before connecting the terminals.