Connecting to Other Instruments
62
Table 4: SERIAL COMM Connector Pin Assignments
Connector
Pin
Signal
Direction
Output
Device
Pin
Output
Device
Signal
1 not used none none none
2 Rx data ← 2 Tx data
3 Tx data → 3 Rx data
4 DTR → 6 DSR
5 Signal Ground ↔ 7 Signal Ground
6 DSR ← 4 RTS
7 RTS → 5 CTS
8 CTS ← 20 DTR
9 Alarm Out → 25 see warning
WARNING: Pin 9 only gives notice of alarm limit
violations. It will not alert a remote system of signal loss
or sensor disconnection. Do not use this Pin to activate
a remote alarm system.
Note: The logic level output of Pin 9 is not intended to
activate a remote alarm system. Its use is intended to
allow remote sensing of alarm limit events only.
Pin 9 output is less than +0.3 V when no alarm limit is violated
and greater than +4.0 V when an alarm limit violation exists.
This pin should be connected to a high-impedance circuit
(greater than 1 megohm) and protected against transient
voltages.
Pin 6 (DSR) must be held high by the connected device if trend
and event data are to be output in ASCII format to that device.
Pin 8 (CTS) may be used to control transmission data. When
held high (positive voltage), data transmission takes place.
When low (negative voltage), data transmission is suspended
temporarily.
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