Instruction manual

ControlWave GFC IS Communication Interface Manual (CI-CW-GFC-ISTRAN)
2-6 Function and Electrical Characteristics Issued Nov-09
2.2.1 Configuring the Hazardous Interface for Switched Mode
To configure the hazardous interface for switched mode, place the
supplied shorting jumper in the HJP1 position marked SW (short HJP1
pins 1 and 2 as shown in Figure 2-1). If you don’t install a jumper at
HJP1 the hazardous interface defaults to switched mode. When you
configure the hazardous interface for switched mode, the HTX outputs
are in a high-impedance state when NRX3 is low (or negative), and the
HTX outputs follow the NRX inputs normally when NRX3 is high
(positive).
2.2.2 Configuring the Hazardous Interface for Unswitched
Mode
To configure the hazardous interface for unswitched mode, place the
supplied shorting jumper in the HJP1 position marked UNSW (short
HJP1 pins 2 and 3). This is the opposite jumper position of that shown
in Figure 2-1. In unswitched mode, the HTX outputs remain on and
they always follow the corresponding NRX inputs.
2.2.3 Configuring the Non-Hazardous Interface for Switched
Mode
To configure the non-hazardous interface for switched mode, place the
supplied shorting jumper in the NJP1 position marked SW (short NJP1
pins 1 and 2 as shown in Figure 2-2). The non-hazardous interface is
also in switched mode by default if you don’t install a jumper at NJP1.
When you configure the non-hazardous interface for switched mode, the
NTX outputs are in a high-impedance state when HRX3 is low (or
negative), and the NTX outputs follow the HRX inputs normally when
HRX3 is high (positive).
2.2.4 Configuring the Non-Hazardous Interface for Unswitched
Mode
To configure the non-hazardous interface for unswitched mode, place
the supplied shorting jumper in the position marked UNSW (short NJP1
pins 2 and 3). This is the opposite jumper position of that shown in
Figure 2-2. In unswitched mode, the NTX outputs are always turned on
and they always follow the corresponding HRX inputs.
2.3 Non-Hazardous Power Output
The non-hazardous power supply is routed through a FET (field effect
transistor) from the power input to an output terminal. The power
supply comes in on the NPIN terminal and switched power goes out on
the NPOUT terminal.