Pepper Computer RS232, RS485 user manual SMDAC1OpenLoop Syntax, Input

Chapter 5 Analog Modules SMART I/O User’s Manual

5.5.8.3 SMDAC1OpenLoop

Syntax

error_code SMDAC1OpenLoop(u_int8 PortNr, u_int8 pStatus);

Description

This function should only be used for the current version of the SM-DAC1 module and checks the wires for open loop in a 4..20mA environment. The result is stored in a register with the following definition.

Register value: 111110 -> channel 0 connected and o.k

101111 -> channel 4 connected and o.k

Input	SM-Port to be accessed
u_int8 PortNr
u_int8 pStatus	Pointer to the location where the status is
	stored:	0	-> line connected and o.k
Output		1	-> line below 4mA

5

error_code

Example

SUCCESS	if module was not initialised
E_SEEK
E-BMODE	if the module is unknown

or standard OS-9 error code (refer to the OS-9 Technical Manual Error Codes Section).

RetVal = SDAC1OpenLoop(0, &Status);

Note

If this function is called and requested for use with a voltage version of the SM-DAC1 module then an error will be returned. Likewise, if a channel is requested that is out of range then an error is returned.

October 01, 1996 ©1996 PEP Modular Computers GmbH Page 5 - 115