Campbell Hausfeld SDM-CAN 사용자 설명서

Once set the switches remain set until changed by another call of P118 or on 
loading a different program. Therefore it is only necessary to call a P118 to set 
these switches once, after program compilation, or when a switch needs to be 
changed using a call of P118 within an IF..THEN program construct (see the 
program examples below). 

Switch ‘a’: 

0 

This digit is currently unused; enter zero 

Switch ‘b’: 

0 

SDM-CAN returns the last value captured from the network, 
even if read before (Default) 

 

1 

SDM-CAN returns –99999 if a data value is requested by the 
datalogger and a new value has not been captured from the 
network, since the last request. 

 2-9 

Currently 

unused 

Switch ‘c’: 

0 

Disable I/O Interrupts (Default) – see section 3.4.1 

 

1 

Enable I/O Interrupts, pulsed mode 

 

2 

Enable I/O Interrupts, fast mode 

 3-7 

Currently 

unused 

 

8 

Set low power standby mode. The SDM-CAN cannot wake from 
this state as a result of CAN-Bus activity. Setting this switch to 
any other value will bring the SDM-CAN out of standby. 

 

9 

Leave this switch setting unchanged 

Switch ‘d’: 

0 

Listen only mode, no CAN transmission or acknowledgement to 
a correctly received CAN frame is possible. The SDM-CAN runs 
in ‘Error Passive’ mode (Default). 

  

1 

One shot transmission, no re-transmission will occur in the 
event of loss of arbitration or error. Frames received correctly 
from an external node are acknowledged 

  

2 

Self-reception. A frame transmitted from the SDM-CAN that was 
acknowledged by an external node will also be received by the 
SDM-CAN but no re-transmission will occur in the event of loss 
of arbitration or error. Frames received correctly from an 
external node are acknowledged 

 

3 

Normal, re-transmission will occur in the event of loss of 
arbitration or error. Frames received correctly from an external 
node are acknowledged. This is the usual setting to use if the 
SDM-CAN is to be used to transmit data. 

 

4 

One shot transmission and self test mode. The SDM-CAN will 
perform a successful transmission even if there is no 
acknowledgement from an external CAN node. Frames received 
correctly from an external node are acknowledged 

 

5 

Self-reception and self test mode. The SDM-CAN will perform a 
successful transmission even if there is no acknowledgement 
from an external CAN node. Frames received correctly from an 
external node are acknowledged. The SDM-CAN will receive its 
own transmission 

 

6 

Normal and self test mode. The SDM-CAN will perform a 
successful transmission even if there is no acknowledgement 
from an external CAN node. Frames received correctly from an 
external node are acknowledged. 

 

7 

Similar to switch setting 'd-3' , but this setting is 'remembered' at 
power-up. During power-up, the SDM-CAN will acknowledge all 
valid messages. 

NOTE: This setting relies on the datalogger having set up the     
SDM-CAN before use. 

 8 

Not 

defined 

  

9 

Leave this switch setting unchanged