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3.4 Serial Data Ports
The 914-HDE has two non-isolated serial ports supporting RS-232, RS-485 or RS-422 signaling protocols.
These three protocols may be configured by the user in the field via the 914 Diagnostic GUI. TTL and PPS are
factory options. All data rates are supported up to 2.5 Mbaud for RS-485 and RS-422 and up to 500 KBaud for
RS-232. Each port can support completely independent serial data links with independent baud rates. By
default, RS-485 and RS-422 inputs are terminated differentially with an on-board 120 resistor that can be
disabled via software configuration. Latency through the Mux/Demux system less than 100 s, not including
fiber delays of 5 ns/m.
For RS-485 which is a half-duplex protocol, a programmable turn-around time is implemented. The default turn-
around time (timeout between Tx and Rx) is set to 1 ms. Serial port settings, including protocol, timeouts, and
terminations may be accessed and changed via the Model 914 Diagnostic GUI.
The serial port connector is Molex Micro-fit P/N 43045-0800. The mating plug is Molex Micro-fit P/N 0430250800
with Molex crimps P/N 0430300010. The pinout is detailed in Table 4. Tx refers to transmit data from the 914-
HDE to the external equipment. Rx refers to receive data into the 914-HDE from the external equipment. Data
coming into the RS-422 RX lines at the remote, for example, will exit from the RS-422 TX lines at the console.
REF.
PIN
1
2
J6
CH1
CH2
3
4
Focal Technologies Corporation
A Moog Inc. Company
Table 3: Serial Data Port Numbering
Port Number
1
2
Table 4: Serial Data Connector Pinout
RS-232
5
RS232-RX
6
GND
7
DO NOT CONNECT
8
RS232-TX
Figure 3-6: Molex Micro-fit P/N 43045-0800
Figure 3-7: Serial Ports 1 and 2
Reference Designator
J6 (lower pin row)
J6 (upper pin row)
MODE
RS-485
DO NOT CONNECT
GND
RS485+
RS485-
Document Number: 914-0601-00 Rev. 4.0
Model 914-HDE User Manual
RS-422
RX 422+
RX 422-
TX 422+
TX 422-
3-7
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