Ceilometer CT25K
User’s Guide CT25K-U059en-2.1
6
1.2.4.2 External Connector J4 - Maintenance line
Maintenance line is intended for on-site maintenance and can be used with
Ceilometer Maintenance Terminal, PC or other terminal.
Connector (J3): Type Binder series 693, 09-4224-06-04
4-pin (male)
Mating connector type: Type Binder series 693, 99-4221-70-04
(female) elbow
Baud Rate: 2400 baud standard and default
300, 4800, 9600 baud available
Distance to Operate: 300 m (1000 ft) at 2400 baud with typical
communication cables
Standard Character Frame: 1 Start Bit
7 Data Bits
Even Parity
1 Stop Bit
Standard Character Code: USASCII
Pin Connections 1 RxD / RD+ (0...5 V)
2 TxD / SD+ (0...5 V)
3 +12 V DC supply from internal battery
(100 mA continuous, 200 mA max.)
4 Signal Ground / Equipment Ground
Overvoltage Protection in each circuit:
Primary Noble Gas Surge Arrester
Secondary VDRs, Transient Zener Diodes or
normal Diodes
1.2.5 Modem Options
1.2.5.1 Modem board DMX55
ITU-T V.21 / Bell 103 full duplex modem interface for serial asynchronous
data interchange
Data Rate: 300 bit/s
Modulation method: FSK
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