AlarmTinkerer
New Member
Hi all,
I apologize if this question has been asked on this forum, but a search couldn't answer my fairly generic questions.
1. I'm currently sizing an auxiliary power supply for 5x 2WTA-B, 2x COSMO2W sensors paired with a COSMOD2W module. I'm trying to calculate the max. power consumption for the loop. If I'm reading the datasheets correctly this is what I've surmised:
Since it'll be used with a COSMOD2W interface module, it'll be 30mA for the alarming 2WTA-B, plus 12mA for all other 2WTA-B units. It'll be 20mA for each COSMO2Ws.
If the COSMO2W is the one in alarm, it'll be 50mA for the alarming COSMO2W, 20mA for the non-alarming COSMO2W, and 12mA for all 2WTA-B.
Then add in about 174mA max. alarm current to the COSMOD2W.
Am I getting this right? Basically I'm not understanding the when a unit would go into "Direct Power" draw mode and my assumption is when it's in alarm state.
2. When connected to the COSMOD2W, I understand the loop is connected to the IDC+/- connections, but do I have to connect the Style-D connections as well?
Thanks - appreciate any help. I'm fairly versed in burglary aspects of the alarm but very little in smoke/CO 2-wire/4-wire loops.
I apologize if this question has been asked on this forum, but a search couldn't answer my fairly generic questions.
1. I'm currently sizing an auxiliary power supply for 5x 2WTA-B, 2x COSMO2W sensors paired with a COSMOD2W module. I'm trying to calculate the max. power consumption for the loop. If I'm reading the datasheets correctly this is what I've surmised:
Since it'll be used with a COSMOD2W interface module, it'll be 30mA for the alarming 2WTA-B, plus 12mA for all other 2WTA-B units. It'll be 20mA for each COSMO2Ws.
If the COSMO2W is the one in alarm, it'll be 50mA for the alarming COSMO2W, 20mA for the non-alarming COSMO2W, and 12mA for all 2WTA-B.
Then add in about 174mA max. alarm current to the COSMOD2W.
Am I getting this right? Basically I'm not understanding the when a unit would go into "Direct Power" draw mode and my assumption is when it's in alarm state.
2. When connected to the COSMOD2W, I understand the loop is connected to the IDC+/- connections, but do I have to connect the Style-D connections as well?
Thanks - appreciate any help. I'm fairly versed in burglary aspects of the alarm but very little in smoke/CO 2-wire/4-wire loops.