JRC JSS-2250 Instruction Manual page 178

Specifications
(3) Printer (NKG-91)
Printing system
Communication interface
Data control
Data buffer
Maximum print speed
Roll paper width
Power supply voltage
Current consumption
(4) Printer (DPU-414)
Printing system
Communication interface
Data control
Data buffer
Maximum print speed
Roll paper width
Power voltage
Current consumption
9-6
Thermal line dot
RS-232C, 4.8/9.6/38.4 kbps
RTS/CTS
4096 byte
20 mm/sec or more
58 mm
6.5 VDC (5 VDC to 8.7 VDC)
Maximum 2 A
Thermal serial dot
RS-232C, 4.8k/9.6k/38.4 kbps
HW busy
About 28 Kbyte
52.5 cps
112 mm
6.5 VDC
Maximum 2 A