BE1-951
Installation
12-33
ASCII Command Communication
ASCII communication byte-framing parameters are fixed at 8 data bits, No parity, and 1 stop bit. Additional
ASCII communication protocol parameters are settable. Baud rate and address are settable from the ASCII
command interface using the SG-COM command. These parameters can also be set at HMI screen 6.1.X.
Several additional settings are available to further customize ASCII communications. These settings are
described Section 9,
Security. Additional parameters for Page Length, Reply Acknowledge, and Software
Handshaking can be changed only through the ASCII command interface using the SG-COM command.
IRIG Input and Connections
The IRIG input is fully isolated and supports IRIG Standard 200-98, Format B002. The demodulated (dc
level-shifted) input signal must be 3.5 volts or higher to be recognized as a high logic level. The maximum
acceptable input voltage range is +10 volts or -10 volts(a 20 volt range). Input burden is nonlinear and rated
at approximately 4 kilo-ohms at 3.5 Vdc and approximately 3 kilo-ohms at 20 Vdc.
IRIG connections are located on a terminal block shared with the RS-485 and input power terminals.
Terminal designations and functions are shown in Table 12-3.
Table 12-3. IRIG Terminal Assignments
Terminal
Function
A1 (+)
Signal
A2 (–)
Reference
CONTACT SENSING INPUT JUMPERS
Four contact sensing inputs provide external stimulus to initiate BE1-951 actions. An external wetting
voltage is required for the contact sensing inputs. The nominal voltage level of the external dc source must
comply with the dc power supply input voltage ranges listed in Section 1,
General Information,
Specifications. To enhance user flexibility, the BE1-951 uses wide range ac/dc power supplies that cover
several common control voltages. The contact sensing input circuits are designed to respond to voltages
at the lower end of the control voltage range while not overheating at the high end of the range.
Energizing levels for the contact sensing inputs are jumper selectable for a minimum of 5 Vdc for 24 Vdc
nominal sensing voltages, 26 Vdc for 48 Vdc nominal sensing voltages, or 69 Vdc for 125 Vdc nominal
sensing voltages. See Table 12-1 for the control voltage ranges.
Table 12-4. Contact Sensing Turn-On Voltage
Nominal Control Voltage
Nominal Turn-On Voltage Range
Jumper Installed
Jumper Removed
24 Vdc
5 - 8 Vdc
N/A
48/125 Vac/Vdc
26 -38 V
69 - 100 V
125/250 Vac/Vdc
69 - 100 V
138 - 200 V
Each BE1-951 is delivered with the contact sensing jumpers installed for operation in the higher end of the
control voltage range. If the contact sensing inputs are to be operated at the lower end of the control voltage
range, the jumpers must be installed on pins 2 and 3.
The following paragraphs describe how to locate and remove/change the contact sensing input jumpers.
1.
Remove the drawout assembly by loosening the two thumb screw and pulling the assembly out
of the case. Observe all electrostatic discharge (ESD) precautions when handling the drawout
assembly.
