Model 914-HDE User Manual
Focal Technologies Corporation
5-2
A Moog Inc. Company
Document Number: 914-0601-00 Rev. 4.0
5.1.1 914-VDX Serial Data Ports
The 914-VDX has four 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 1.25 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 is less than 500
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 11. Tx refers to transmit data from the 914-
VDX to the external equipment. Rx refers to receive data into the 914-VDX 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.
Table 10: Serial Data Port Numbering
Port Number
Reference Designator
1
J5 (lower pin row)
2
J5 (upper pin row)
3
J3 (lower pin row)
4
J3 (upper pin row)
Table 11: Serial Data Connector Pinout
REF.
PIN
MODE
RS-232
RS-485
RS-422
J6
CH1
1
CH2
5
RS232-RX
DO NOT CONNECT
RX 422+
2
6
GND
GND
RX 422-
3
7
DO NOT CONNECT
RS485+
TX 422+
4
8
RS232-TX
RS485-
TX 422-
Figure 5-2: Molex Micro-fit
P/N 43045-0800
Figure 5-3: VDX Serial Ports
