Campbell-scientific MD485 RS-485 Multidrop Interface Manual de usuario descargar pdf (Pagina 65)

Appendix H. MD485 Port Pin

Descriptions

CS I/O Port

The CS I/O port is Campbell Scientific's input/output port. It is not a standard

RS-232 pin-out. The following table provides pin-out information on the port

when connected to a datalogger.

CS I/O CONNECTOR, 9-PIN D-SUB MALE

PIN I/O FUNCTION DESCRIPTION

1 NC

5 V Supplied by

Datalogger

Datalogger sources 5 VDC to

power peripherals

2 GND GND GND

3 O Ring

Raised by modem to put

datalogger into

telecommunications mode

4 O RX Serial data receive line

5 I Modem Enable

Raised when datalogger

determines that associated modem

raised the ring line

6 I

Synchronous Device

Enable

Used by datalogger to address

synchronous devices; can be used

as a printer enable

7 I CLK/Handshake

Used by datalogger with SDE and

TX lines to transfer data to

synchronous devices

8 PWR

12 V Supplied by

Datalogger

Datalogger sources 12 VDC to

power peripherals

9 I TX Serial data transmit line

I = Signal Into the MD485, O = Signal Out of the MD485, NC = No

Connection

RS-232 Port

The “RS-232” port is a partial implementation of RS-232C. It is configured as

Data Communications Equipment (DCE) for direct cable connection to Data

Terminal Equipment (DTE) such as a PC serial port.

H-1

1 2 ... 60 61 62 63 64 65 66 67 68

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