Zeta Alarm Systems.
Classic 2000 Mk II Operation Manual
Revision 1.0
Part # MAN-Z3K-01
Page 9
1.4.6 RS-485 Network
Maximum number of devices - 127
EIA-485 Circuit rating - 5.5VDC max., 250mA(short circuit)
Data Transfer Rate – 19,200 Baud
Recommended Wire Type – 14-22 AWG twisted - pair (See Sec. 1.4.8.3)
Maximum Cable Length - 8000 ft. (@16AWG)
Maximum Total Cable Resistance – 50 Ohms
Maximum Cable Capacitance – 0.3µF
NOTE: Refer to Section 6.5 for serial device specifications.
1.4.7 Communication/Printer Ports - ZSCP3/ZICP
RS-232 Port Specifications
Data Rate - 9600 bps
Data Bits - 8 data bits
Stop Bits – 1 stop bits
Parity - None
Data Flow Control - XON/XOFF
Connector Type - DB9 Male
Connector Pinout*
Pin #
Pin Name
Pin Function
Input/Output
1
DCD
Data Carrier Detect
Not Connected
2
RX
Receive Data
Input
3
TX
Transmit Data
Output
4
DTR
Data Terminal Ready
Output
5
GND
Signal Ground
Bi-directional
6
DSR
Data Set Ready
Not Connected
7
RTS
Request To Send
Output
8
CTS
Clear To Send
Input
9
RI
Ring Indicator
Not Connected
NOTE: Pin 4 (DTR) is connected to Pin 6 (DSR) on the ZSCP3 and ZICP printed circuit boards.
*Type of Cable - The above printout applies only to the ZSCP3. Pins 2 and 3 are opposite on the ZICP.
Thus, the ZSCP3 requires a Null Modem cable; the ZICP requires a Straight-Through cable. Both cables
must be DB9, Female-to-Female.
Maximum Cable Length -
Determined by data rate and cable capacitance (typically max 50 ft)
Maximum Cable Capacitance -
2500 pF at a data rate of 9600 bps
Less cable capacitance will allow longer cable runs.
Any ITE listed equipment device connected to the ZSCP3 RS232 port must have an isolated ground
Any ITE listed equipment connected to the ZSCP3 with a ground referenced to earth ground will
cause a ground fault trouble in the Classic 2000 Mk II Control Panel.
USE THE ZETA ISOLATED COMMUNICATION PORT (ZICP) for connection to ITE Equipment without
isolated ground.
