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HMP240

M210300en Appendix 2: RS 485/422 serial port module

3.2 Dual loop operation

The following procedure must be repeated with all transmitters.

• Open the transmitter cover.

• Pull out the RS 485/422 serial port module, if it is already mounted.

• Set the serial port of the terminal to 4800 baud, even parity, seven

data bits and one stop bit, full duplex (4800 E 7 1 FDX).

• The serial settings of the transmitter must also be 4800 E 7 1 FDX

and the transmitter must be in STOP mode. If these factory settings

have been changed, they must be returned. Connect the RS 232C port

of the terminal to connector X17 on the top of the main board and

switch the power on.

When dual loop is used, the jumpers in connector X4 on the module board

must be as shown below.

X1 X2

• Set the address of the transmitter; you can choose any number

between 1 and 99. In this example the address is 22:

>addr 22

Address : 22

• Set the serial bus settings according to your system. This setting will

become valid after next RESET or power off:

>seri 2400 e 7 1 f

2400 E 7 1 FDX

• Switch echo on:

>echo on

ECHO : ON

• Change the serial output mode into POLL:

>smode poll

Serial mode : POLL

NOTE 1

The SMODE command must be given last.

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